Thanks for posting your question in the Microsoft Q&A forum.
To resolve this issue:
- Attempt to create the host pool in a supported metadata region and then add session hosts, explicitly selecting Sweden Central as the VM region
- If that doesn't work, try using PowerShell or Azure CLI to create the session hosts, which might bypass any UI-related issues.
- Contact Azure support if the problem persists, as they can check for any account-specific restrictions or regional issues affecting your deployment.
Please don't forget to close up the thread here by upvoting and accept it as an answer if it is helpful