Hi Julian,
Thank you for reaching out. My name is Furkaan, a user just like you. I’d be happy to help you with your concerns. The error message "We couldn't complete that action" you're seeing in Microsoft Teams when trying to create a new team is a general error message and doesn't provide specific details about the cause. However, there are a couple of things you can try to troubleshoot the issue:
Restart Microsoft Teams: Sometimes a simple restart can resolve temporary glitches that might be causing the error. Close Microsoft Teams completely, then relaunch it and try creating a new team again. Check your internet connection: Make sure you have a stable internet connection. A weak or intermittent connection can sometimes cause problems with creating teams in Microsoft Teams. Sign out and sign back in: Signing out of your Microsoft Teams account and then signing back in can sometimes refresh your connection and resolve the issue. If none of these suggestions work, contact Microsoft support for further assistance.
If you have any additional questions or concerns, please don’t hesitate to reach out. Give back to the Community. Help the next person who has this issue by indicating if this reply solved your problem. Click Yes or No below. Best Regards, Furkaan