Try with hardcoded name.

.ci/azure-pipelines.yml

@@ -123,7 +123,7 @@ jobs:
       inputs:
         buildType: 'specific' # Options: current, specific
         project: 'jellyfin' #$(System.TeamProjectId)' # Required when buildType == Specific
-        pipeline: 1 #'$(System.DefinitionId)' # Required when buildType == Specific, not sure if this will take a name too
+        pipeline: 'Jellyfin CI' #'$(System.DefinitionId)' # Required when buildType == Specific, not sure if this will take a name too
         #specificBuildWithTriggering: false # Optional
         buildVersionToDownload: 'latestFromBranch' # Required when buildType == Specific# Options: latest, latestFromBranch, specific
         branchName: 'refs/heads/$(System.PullRequest.TargetBranch)' # Required when buildType == Specific && BuildVersionToDownload == LatestFromBranch