@Francesco Ghigo
Welcome to Microsoft Q&A Platform, thanks for posting your query here. Azure DevOps related queries/issues are currently not supported on this Microsoft Q&A platform.
I would request you to please post your queries in dedicated forums as in below links:
https://developercommunity.visualstudio.com/spaces/21/index.html
https://developercommunity.visualstudio.com/t/get-unique-id-from-devops-organization/756710