The 401 - Unauthorized error typically indicates an issue with authentication. Here are a few things to check: Personal Access Token (PAT) ,Authentication Method,Base URL ,Check Permissions 

Hi Daianne,

You can always check the LifeTime logs for more detailed error information—they can often provide insights beyond what the Azure DevOps response provides.

That said, a 401 - Unauthorized error is typically related to Azure DevOps token permissions. Even if the token looks correct, it's worth verifying that:

• The PAT (Personal Access Token) hasn’t expired
• It has the correct scopes, especially for Build (read & execute) and Project & Team (read) permissions
• The user associated with the PAT has access to the project and pipeline you’re trying to trigger

Let us know if checking the token and logs helps clarify the root cause!

Best regards,
Duarte