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When I tray to add a Power BI on my MS Teams Channel, I can't see any workspace. Below the field to select the workspace I got this message "Tente novamente mais tarde"
My power bi is in a Pro version, and the MS user is the same in both apps.
You could check the Issues forum here:
https://community.powerbi.com/t5/Issues/idb-p/Issues
And if it is not there, then you could post it.
If you have Pro account you could try to open a support ticket. If you have a Pro account it is free. Go to https://support.powerbi.com. Scroll down and click "CREATE SUPPORT TICKET".