diff --git a/package-lock.json b/package-lock.json
index 67a82996..b861913b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,11 +1,11 @@
 {
   "name": "serverless-newrelic-lambda-layers",
-  "version": "2.1.2",
+  "version": "2.1.3",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
-      "version": "2.1.2",
+      "version": "2.1.3",
       "license": "Apache-2.0",
       "dependencies": {
         "fs-extra": "^9.1.0",
diff --git a/package.json b/package.json
index f60f4f13..d2cbdba0 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "serverless-newrelic-lambda-layers",
-  "version": "2.1.2",
+  "version": "2.1.3",
   "description": "Serverless plugin for NewRelic APM AWS Lambda layers.",
   "main": "dist/index.js",
   "files": [
diff --git a/src/index.ts b/src/index.ts
index 50adb053..4ddff0e8 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -450,9 +450,9 @@ https://blog.newrelic.com/product-news/aws-lambda-extensions-integrations/
 
     environment.NEW_RELIC_TRUSTED_ACCOUNT_KEY = environment.NEW_RELIC_TRUSTED_ACCOUNT_KEY
       ? environment.NEW_RELIC_TRUSTED_ACCOUNT_KEY
-      : environment.NEW_RELIC_ACCOUNT_ID
-      ? environment.NEW_RELIC_ACCOUNT_ID
-      : this.config.trustedAccountKey;
+      : this.config.trustedAccountKey
+      ? this.config.trustedAccountKey
+      : environment.NEW_RELIC_ACCOUNT_ID;
 
     if (runtime.match("python")) {
       environment.NEW_RELIC_SERVERLESS_MODE_ENABLED = "true";
diff --git a/tests/fixtures/trusted-account-key-excluded.input.service.json b/tests/fixtures/trusted-account-key-excluded.input.service.json
new file mode 100644
index 00000000..1f4e61fc
--- /dev/null
+++ b/tests/fixtures/trusted-account-key-excluded.input.service.json
@@ -0,0 +1,46 @@
+{
+  "service": "newrelic-lambda-layers-nodejs-example",
+  "provider": {
+    "name": "aws",
+    "stage": "prod",
+    "region": "us-east-1",
+    "stackTags": {
+      "environment": "us-testing",
+      "owning_team": "LAMBDA",
+      "product": "aws-lambda"
+    },
+    "tags": {
+      "environment": "us-testing",
+      "owning_team": "LAMBDA",
+      "product": "aws-lambda"
+    }
+  },
+  "plugins": ["serverless-newrelic-lambda-layers"],
+  "configValidationMode": "warn",
+  "custom": {
+    "newRelic": {
+      "accountId": "${env:NEW_RELIC_ACCOUNT_ID}"
+    }
+  },
+  "disabledDeprecations": [],
+  "functions": {
+    "layer-nodejs10x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "handler.handler",
+      "package": { "exclude": ["./**"], "include": ["handler.js"] },
+      "runtime": "nodejs10.x"
+    },
+    "layer-nodejs12x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "handler.handler",
+      "package": { "exclude": ["./**"], "include": ["handler.js"] },
+      "runtime": "nodejs12.x"
+    },
+    "layer-nodejs14x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "handler.handler",
+      "package": { "exclude": ["./**"], "include": ["handler.js"] },
+      "runtime": "nodejs14.x"
+    }
+  }
+}
diff --git a/tests/fixtures/trusted-account-key-excluded.output.service.json b/tests/fixtures/trusted-account-key-excluded.output.service.json
new file mode 100644
index 00000000..e8b50e3d
--- /dev/null
+++ b/tests/fixtures/trusted-account-key-excluded.output.service.json
@@ -0,0 +1,89 @@
+{
+  "service": "newrelic-lambda-layers-nodejs-example",
+  "provider": {
+    "name": "aws",
+    "stage": "prod",
+    "region": "us-east-1",
+    "stackTags": {
+      "environment": "us-testing",
+      "owning_team": "LAMBDA",
+      "product": "aws-lambda"
+    },
+    "tags": {
+      "environment": "us-testing",
+      "owning_team": "LAMBDA",
+      "product": "aws-lambda"
+    }
+  },
+  "plugins": ["serverless-newrelic-lambda-layers"],
+  "configValidationMode": "warn",
+  "custom": {
+    "newRelic": {
+      "accountId": "${env:NEW_RELIC_ACCOUNT_ID}",
+      "enableExtension": true
+    }
+  },
+  "disabledDeprecations": [],
+  "functions": {
+    "layer-nodejs10x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "newrelic-lambda-wrapper.handler",
+      "layers": [
+        "arn:aws:lambda:us-east-1:451483290750:layer:NewRelicNodeJS10X:54"
+      ],
+      "package": {
+        "exclude": ["./**", "!newrelic-wrapper-helper.js"],
+        "include": ["handler.js"]
+      },
+      "runtime": "nodejs10.x",
+      "environment": {
+        "NEW_RELIC_ACCOUNT_ID": "${env:NEW_RELIC_ACCOUNT_ID}",
+        "NEW_RELIC_APP_NAME": "layer-nodejs10x",
+        "NEW_RELIC_LAMBDA_EXTENSION_ENABLED": "true",
+        "NEW_RELIC_LAMBDA_HANDLER": "handler.handler",
+        "NEW_RELIC_NO_CONFIG_FILE": "true",
+        "NEW_RELIC_TRUSTED_ACCOUNT_KEY": "${env:NEW_RELIC_ACCOUNT_ID}"
+      }
+    },
+    "layer-nodejs12x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "newrelic-lambda-wrapper.handler",
+      "layers": [
+        "arn:aws:lambda:us-east-1:451483290750:layer:NewRelicNodeJS12X:52"
+      ],
+      "package": {
+        "exclude": ["./**", "!newrelic-wrapper-helper.js"],
+        "include": ["handler.js"]
+      },
+      "runtime": "nodejs12.x",
+      "environment": {
+        "NEW_RELIC_ACCOUNT_ID": "${env:NEW_RELIC_ACCOUNT_ID}",
+        "NEW_RELIC_APP_NAME": "layer-nodejs12x",
+        "NEW_RELIC_LAMBDA_EXTENSION_ENABLED": "true",
+        "NEW_RELIC_LAMBDA_HANDLER": "handler.handler",
+        "NEW_RELIC_NO_CONFIG_FILE": "true",
+        "NEW_RELIC_TRUSTED_ACCOUNT_KEY": "${env:NEW_RELIC_ACCOUNT_ID}"
+      }
+    },
+    "layer-nodejs14x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "newrelic-lambda-wrapper.handler",
+      "layers": [
+        "arn:aws:lambda:us-east-1:451483290750:layer:NewRelicNodeJS14X:22"
+      ],
+      "package": {
+        "exclude": ["./**", "!newrelic-wrapper-helper.js"],
+        "include": ["handler.js"]
+      },
+      "runtime": "nodejs14.x",
+      "environment": {
+        "NEW_RELIC_ACCOUNT_ID": "${env:NEW_RELIC_ACCOUNT_ID}",
+        "NEW_RELIC_APP_NAME": "layer-nodejs14x",
+        "NEW_RELIC_LAMBDA_EXTENSION_ENABLED": "true",
+        "NEW_RELIC_LAMBDA_HANDLER": "handler.handler",
+        "NEW_RELIC_NO_CONFIG_FILE": "true",
+        "NEW_RELIC_TRUSTED_ACCOUNT_KEY": "${env:NEW_RELIC_ACCOUNT_ID}"
+      }
+    }
+  }
+}
diff --git a/tests/fixtures/trusted-account-key-included.input.service.json b/tests/fixtures/trusted-account-key-included.input.service.json
new file mode 100644
index 00000000..46f30458
--- /dev/null
+++ b/tests/fixtures/trusted-account-key-included.input.service.json
@@ -0,0 +1,47 @@
+{
+  "service": "newrelic-lambda-layers-nodejs-example",
+  "provider": {
+    "name": "aws",
+    "stage": "prod",
+    "region": "us-east-1",
+    "stackTags": {
+      "environment": "us-testing",
+      "owning_team": "LAMBDA",
+      "product": "aws-lambda"
+    },
+    "tags": {
+      "environment": "us-testing",
+      "owning_team": "LAMBDA",
+      "product": "aws-lambda"
+    }
+  },
+  "plugins": ["serverless-newrelic-lambda-layers"],
+  "configValidationMode": "warn",
+  "custom": {
+    "newRelic": {
+      "accountId": "${env:NEW_RELIC_ACCOUNT_ID}",
+      "trustedAccountKey": "${env:NEW_RELIC_TRUSTED_ACCOUNT_KEY}"
+    }
+  },
+  "disabledDeprecations": [],
+  "functions": {
+    "layer-nodejs10x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "handler.handler",
+      "package": { "exclude": ["./**"], "include": ["handler.js"] },
+      "runtime": "nodejs10.x"
+    },
+    "layer-nodejs12x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "handler.handler",
+      "package": { "exclude": ["./**"], "include": ["handler.js"] },
+      "runtime": "nodejs12.x"
+    },
+    "layer-nodejs14x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "handler.handler",
+      "package": { "exclude": ["./**"], "include": ["handler.js"] },
+      "runtime": "nodejs14.x"
+    }
+  }
+}
diff --git a/tests/fixtures/trusted-account-key-included.output.service.json b/tests/fixtures/trusted-account-key-included.output.service.json
new file mode 100644
index 00000000..af93e0be
--- /dev/null
+++ b/tests/fixtures/trusted-account-key-included.output.service.json
@@ -0,0 +1,90 @@
+{
+  "service": "newrelic-lambda-layers-nodejs-example",
+  "provider": {
+    "name": "aws",
+    "stage": "prod",
+    "region": "us-east-1",
+    "stackTags": {
+      "environment": "us-testing",
+      "owning_team": "LAMBDA",
+      "product": "aws-lambda"
+    },
+    "tags": {
+      "environment": "us-testing",
+      "owning_team": "LAMBDA",
+      "product": "aws-lambda"
+    }
+  },
+  "plugins": ["serverless-newrelic-lambda-layers"],
+  "configValidationMode": "warn",
+  "custom": {
+    "newRelic": {
+      "accountId": "${env:NEW_RELIC_ACCOUNT_ID}",
+      "enableExtension": true,
+      "trustedAccountKey": "${env:NEW_RELIC_TRUSTED_ACCOUNT_KEY}"
+    }
+  },
+  "disabledDeprecations": [],
+  "functions": {
+    "layer-nodejs10x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "newrelic-lambda-wrapper.handler",
+      "layers": [
+        "arn:aws:lambda:us-east-1:451483290750:layer:NewRelicNodeJS10X:54"
+      ],
+      "package": {
+        "exclude": ["./**", "!newrelic-wrapper-helper.js"],
+        "include": ["handler.js"]
+      },
+      "runtime": "nodejs10.x",
+      "environment": {
+        "NEW_RELIC_ACCOUNT_ID": "${env:NEW_RELIC_ACCOUNT_ID}",
+        "NEW_RELIC_APP_NAME": "layer-nodejs10x",
+        "NEW_RELIC_LAMBDA_EXTENSION_ENABLED": "true",
+        "NEW_RELIC_LAMBDA_HANDLER": "handler.handler",
+        "NEW_RELIC_NO_CONFIG_FILE": "true",
+        "NEW_RELIC_TRUSTED_ACCOUNT_KEY": "${env:NEW_RELIC_TRUSTED_ACCOUNT_KEY}"
+      }
+    },
+    "layer-nodejs12x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "newrelic-lambda-wrapper.handler",
+      "layers": [
+        "arn:aws:lambda:us-east-1:451483290750:layer:NewRelicNodeJS12X:52"
+      ],
+      "package": {
+        "exclude": ["./**", "!newrelic-wrapper-helper.js"],
+        "include": ["handler.js"]
+      },
+      "runtime": "nodejs12.x",
+      "environment": {
+        "NEW_RELIC_ACCOUNT_ID": "${env:NEW_RELIC_ACCOUNT_ID}",
+        "NEW_RELIC_APP_NAME": "layer-nodejs12x",
+        "NEW_RELIC_LAMBDA_EXTENSION_ENABLED": "true",
+        "NEW_RELIC_LAMBDA_HANDLER": "handler.handler",
+        "NEW_RELIC_NO_CONFIG_FILE": "true",
+        "NEW_RELIC_TRUSTED_ACCOUNT_KEY": "${env:NEW_RELIC_TRUSTED_ACCOUNT_KEY}"
+      }
+    },
+    "layer-nodejs14x": {
+      "events": [{ "schedule": "rate(5 minutes)" }],
+      "handler": "newrelic-lambda-wrapper.handler",
+      "layers": [
+        "arn:aws:lambda:us-east-1:451483290750:layer:NewRelicNodeJS14X:22"
+      ],
+      "package": {
+        "exclude": ["./**", "!newrelic-wrapper-helper.js"],
+        "include": ["handler.js"]
+      },
+      "runtime": "nodejs14.x",
+      "environment": {
+        "NEW_RELIC_ACCOUNT_ID": "${env:NEW_RELIC_ACCOUNT_ID}",
+        "NEW_RELIC_APP_NAME": "layer-nodejs14x",
+        "NEW_RELIC_LAMBDA_EXTENSION_ENABLED": "true",
+        "NEW_RELIC_LAMBDA_HANDLER": "handler.handler",
+        "NEW_RELIC_NO_CONFIG_FILE": "true",
+        "NEW_RELIC_TRUSTED_ACCOUNT_KEY": "${env:NEW_RELIC_TRUSTED_ACCOUNT_KEY}"
+      }
+    }
+  }
+}