diff --git a/virtual-organizations/ATLAS.yaml b/virtual-organizations/ATLAS.yaml
index 5c6ca9291..fc6febead 100644
--- a/virtual-organizations/ATLAS.yaml
+++ b/virtual-organizations/ATLAS.yaml
@@ -14,8 +14,22 @@ Credentials:
       Subject: 750e9609-485a-4ed4-bf16-d5cc46c71024
       URL: https://atlas-auth.web.cern.ch/
       DefaultUnixUser: usatlas3
-    # - Description: ATLAS IAM development instance
-    #   URL: https://atlas-auth.cern.ch/
+
+    # IAM development instances
+
+    - Description: ATLAS IAM development instance
+      Subject: 7dee38a3-6ab8-4fe2-9e4c-58039c21d817
+      URL: https://atlas-auth.cern.ch/
+      DefaultUnixUser: usatlas1
+    - Description: ATLAS SAM/ETF (development)
+      Subject: 5c5d2a4d-9177-3efa-912f-1b4e5c9fb660
+      URL: https://atlas-auth.cern.ch/
+      DefaultUnixUser: usatlas2
+    - Description: ATLAS analysis (development)
+      Subject: 750e9609-485a-4ed4-bf16-d5cc46c71024
+      URL: https://atlas-auth.cern.ch/
+      DefaultUnixUser: usatlas3
+
 Community: The ATLAS physics community.
 Contacts:
   Administrative Contact:
diff --git a/virtual-organizations/CMS.yaml b/virtual-organizations/CMS.yaml
index b91117c38..c740c0b34 100644
--- a/virtual-organizations/CMS.yaml
+++ b/virtual-organizations/CMS.yaml
@@ -39,8 +39,42 @@ Credentials:
       URL: https://cms-auth.web.cern.ch/
       DefaultUnixUser: uscms
 
-    # - Description: CMS IAM development instance
-    #   URL: https://CMS-auth.cern.ch/
+    # IAM development instances
+
+    - Description: CMS IAM development instance
+      Subject: bad55f4e-602c-4e8d-a5c5-bd8ffb762113
+      URL: https://CMS-auth.cern.ch/
+      DefaultUnixUser: cmspilot
+
+    - Description: SAM/ETF tests (development)
+      Subject: 08ca855e-d715-410e-a6ff-ad77306e1763
+      URL: https://CMS-auth.cern.ch/
+      DefaultUnixUser: lcgadmin
+
+    - Description: CMS ITB pilots (development)
+      Subject: 490a9a36-0268-4070-8813-65af031be5a3
+      URL: https://CMS-auth.cern.ch/
+      DefaultUnixUser: cmspilot
+
+    - Description: CMS LOCAL pilots (development)
+      Subject: 07f75a9a-bb78-4735-938b-7e61b2b62d5c
+      URL: https://CMS-auth.cern.ch/
+      DefaultUnixUser: cmslocal
+
+    - Description: CMS ITB LOCAL pilots (development)
+      Subject: efbed8c1-f9a7-4063-92f7-f89c04ce04a3
+      URL: https://CMS-auth.cern.ch/
+      DefaultUnixUser: cmslocal
+
+    - Description: USCMS LOCAL pilots (development)
+      Subject: 99b97e4f-5cf0-4d3b-9fcc-82fa86dca1e8
+      URL: https://CMS-auth.cern.ch/
+      DefaultUnixUser: uscmslocal
+
+    - Description: USCMS HEPCloud pilots (development)
+      Subject: 2f327ad0-1934-4635-8ba3-ee72da0a304c
+      URL: https://CMS-auth.cern.ch/
+      DefaultUnixUser: uscms
 Contacts:
   Administrative Contact:
   - ID: 8489f9d11ec9723ae9f11619d325dbfa5516397c