diff --git a/tools/generators/pbxnativetargets/src/Generator/CalculateSharedBuildSettings.swift b/tools/generators/pbxnativetargets/src/Generator/CalculateSharedBuildSettings.swift
index 90ded277d5..1a3506406c 100644
--- a/tools/generators/pbxnativetargets/src/Generator/CalculateSharedBuildSettings.swift
+++ b/tools/generators/pbxnativetargets/src/Generator/CalculateSharedBuildSettings.swift
@@ -18,17 +18,17 @@ extension Generator {
         func callAsFunction(
             name: String,
             label: BazelLabel,
+            platforms: OrderedSet<Platform>,
             productType: PBXProductType,
             productName: String,
-            platforms: OrderedSet<Platform>,
             uiTestHostName: String?
         ) -> [BuildSetting] {
             return callable(
                 /*name:*/ name,
                 /*label:*/ label,
+                /*platforms:*/ platforms,
                 /*productType:*/ productType,
                 /*productName:*/ productName,
-                /*platforms:*/ platforms,
                 /*uiTestHostName:*/ uiTestHostName
             )
         }
@@ -41,18 +41,18 @@ extension Generator.CalculateSharedBuildSettings {
     typealias Callable = (
         _ name: String,
         _ label: BazelLabel,
+        _ platforms: OrderedSet<Platform>,
         _ productType: PBXProductType,
         _ productName: String,
-        _ platforms: OrderedSet<Platform>,
         _ uiTestHostName: String?
     ) -> [BuildSetting]
 
     static func defaultCallable(
         name: String,
         label: BazelLabel,
+        platforms: OrderedSet<Platform>,
         productType: PBXProductType,
         productName: String,
-        platforms: OrderedSet<Platform>,
         uiTestHostName: String?
     ) -> [BuildSetting] {
         var buildSettings: [BuildSetting] = []
@@ -73,10 +73,33 @@ extension Generator.CalculateSharedBuildSettings {
         buildSettings.append(
             .init(key: "SDKROOT", value: platforms.first!.os.sdkRoot)
         )
+
+        var supportedPlatforms = platforms
+        if productType == .appExtension {
+            // Xcode has a bug where if we don't include device platforms in
+            // app extension targets, then it will fail to install the hosting
+            // application
+            if let index = supportedPlatforms.firstIndex(of: .iOSSimulator) {
+                supportedPlatforms.insert(.iOSDevice, at: index + 1)
+            }
+            if let index = supportedPlatforms.firstIndex(of: .tvOSSimulator) {
+                supportedPlatforms.insert(.tvOSDevice, at: index + 1)
+            }
+            if let index = supportedPlatforms.firstIndex(
+                of: .watchOSSimulator
+            ) {
+                supportedPlatforms.insert(.watchOSDevice, at: index + 1)
+            }
+            if let index = supportedPlatforms.firstIndex(
+                of: .visionOSSimulator
+            ) {
+                supportedPlatforms.insert(.visionOSDevice, at: index + 1)
+            }
+        }
         buildSettings.append(
             .init(
                 key: "SUPPORTED_PLATFORMS",
-                value: platforms.map(\.rawValue).joined(separator: " ")
+                value: supportedPlatforms.map(\.rawValue).joined(separator: " ")
                     .pbxProjEscaped
             )
         )
diff --git a/tools/generators/pbxnativetargets/src/Generator/CreateXcodeConfigurations.swift b/tools/generators/pbxnativetargets/src/Generator/CreateXcodeConfigurations.swift
index 49e33e852b..00b8d8c82b 100644
--- a/tools/generators/pbxnativetargets/src/Generator/CreateXcodeConfigurations.swift
+++ b/tools/generators/pbxnativetargets/src/Generator/CreateXcodeConfigurations.swift
@@ -155,11 +155,11 @@ extension Generator.CreateXcodeConfigurations {
         let sharedBuildSettings = calculateSharedBuildSettings(
             name: name,
             label: label,
-            productType: productType,
-            productName: productName,
             platforms: OrderedSet(
                 platformVariants.map(\.platform).sorted()
             ),
+            productType: productType,
+            productName: productName,
             uiTestHostName: uiTestHostName
         )
 
diff --git a/tools/generators/pbxnativetargets/test/Generator/CalculateSharedBuildSettingsTests.swift b/tools/generators/pbxnativetargets/test/Generator/CalculateSharedBuildSettingsTests.swift
index 3a0a35541d..f134876637 100644
--- a/tools/generators/pbxnativetargets/test/Generator/CalculateSharedBuildSettingsTests.swift
+++ b/tools/generators/pbxnativetargets/test/Generator/CalculateSharedBuildSettingsTests.swift
@@ -152,6 +152,42 @@ class CalculateSharedBuildSettingsTests: XCTestCase {
         )
     }
 
+    func test_platforms_appExtension() {
+        // Arrange
+
+        let platforms: OrderedSet<Platform> = [
+            .tvOSSimulator,
+            .visionOSDevice,
+            .visionOSSimulator,
+            .macOS,
+            .watchOSDevice,
+            .iOSSimulator,
+        ]
+        let productType = PBXProductType.appExtension
+
+        // Order is wrong, but it shows that we don't do sorting in this
+        // function
+        let expectedBuildSettings = baseBuildSettings.updating([
+            "SDKROOT": "appletvos",
+            "SUPPORTED_PLATFORMS": #""appletvsimulator appletvos xros xrsimulator macosx watchos iphonesimulator iphoneos""#,
+            "SUPPORTS_MAC_DESIGNED_FOR_IPHONE_IPAD": "NO",
+        ])
+
+        // Act
+
+        let buildSettings = calculateSharedBuildSettingsWithDefaults(
+            platforms: platforms,
+            productType: productType
+        )
+
+        // Assert
+
+        XCTAssertNoDifference(
+            buildSettings.asDictionary,
+            expectedBuildSettings
+        )
+    }
+
     func test_staticFramework() {
         // Arrange
 
@@ -237,17 +273,17 @@ class CalculateSharedBuildSettingsTests: XCTestCase {
 private func calculateSharedBuildSettingsWithDefaults(
         name: String = "A",
         label: BazelLabel = "@//A",
+        platforms: OrderedSet<Platform> = [.macOS],
         productType: PBXProductType = .staticLibrary,
         productName: String = "product_name",
-        platforms: OrderedSet<Platform> = [.macOS],
         uiTestHostName: String? = nil
 ) -> [BuildSetting] {
     return Generator.CalculateSharedBuildSettings.defaultCallable(
         name: name,
         label: label,
+        platforms: platforms,
         productType: productType,
         productName: productName,
-        platforms: platforms,
         uiTestHostName: uiTestHostName
     )
 }