diff --git a/azure-pipelines-internal-tests.yml b/azure-pipelines-internal-tests.yml
index 02278646f5c..3296bada682 100644
--- a/azure-pipelines-internal-tests.yml
+++ b/azure-pipelines-internal-tests.yml
@@ -160,15 +160,39 @@ extends:
               demands: ImageOverride -equals 1es-ubuntu-2204
               os: linux
             variables:
+              - _runCounter: $[counter(variables['Build.Reason'], 0)]
               # Rely on task Arcade injects, not auto-injected build step.
               - skipComponentGovernanceDetection: true
+              - ${{ if notin(variables['Build.Reason'], 'PullRequest', 'Schedule') }}:
+                - _CosmosConnectionUrl: 'true'
             steps:
+              - bash: |
+                  echo "##vso[task.setvariable variable=_CosmosConnectionUrl]https://ef-nightly-test.documents.azure.com:443/"
+                displayName: Prepare to run Cosmos tests on ef-nightly-test
+                condition: and(eq(variables['_CosmosConnectionUrl'], 'true'), or(endsWith(variables['_runCounter'], '0'), endsWith(variables['_runCounter'], '2'), endsWith(variables['_runCounter'], '4'), endsWith(variables['_runCounter'], '6'), endsWith(variables['_runCounter'], '8')))
+              - bash: |
+                  echo "##vso[task.setvariable variable=_CosmosConnectionUrl]https://ef-pr-test.documents.azure.com:443/"
+                displayName: Prepare to run Cosmos tests on ef-pr-test
+                condition: and(eq(variables['_CosmosConnectionUrl'], 'true'), or(endsWith(variables['_runCounter'], '1'), endsWith(variables['_runCounter'], '3'), endsWith(variables['_runCounter'], '5'), endsWith(variables['_runCounter'], '7'), endsWith(variables['_runCounter'], '9')))
               - template: /eng/common/templates-official/steps/enable-internal-sources.yml
               - template: /eng/common/templates-official/steps/enable-internal-runtimes.yml
               - script: eng/common/build.sh --restore --build --test --pack --ci --configuration $(_BuildConfig) --prepareMachine $(_InternalRuntimeDownloadArgs)
                 displayName: Build
+              - task: AzureCLI@2
+                displayName: Run Cosmos tests
+                condition: notin(variables['Build.Reason'], 'PullRequest', 'Schedule')
+                inputs:
+                  azureSubscription: EFCosmosTesting
+                  addSpnToEnvironment: true
+                  scriptType: bash
+                  scriptLocation: 'inlineScript'
+                  inlineScript: |
+                      ./test.sh --ci --configuration $(_BuildConfig) --projects $(Build.SourcesDirectory)/test/EFCore.Cosmos.FunctionalTests/EFCore.Cosmos.FunctionalTests.csproj
                 env:
                   Test__Cosmos__DefaultConnection: $(_CosmosConnectionUrl)
+                  Test__Cosmos__UseTokenCredential: true
+                  Test__Cosmos__SubscriptionId: d709b837-4a74-4aec-addc-b6e4b9b23e7e
+                  Test__Cosmos__ResourceGroup: efcosmosci
                 name: Build
             templateContext:
               sdl: