Same here and seen elsewhere, this seems top be a recent Teams bug on the backend.
owners get an error while trying to turn a file (.docx or .xlsx) into a tab in the main channel.

Hello
Please i nee your help on this issue.
While using the Teams app or the web interface, owners get an error while trying to turn a file (.docx or .xlsx) into a tab in the main channel.
This previously did not happen.
What was attempted:
-Removing and re-adding ownership rights -] error persists
-Removing owner from team then re-adding as owner -] error persists
-Adding a new user as owner -] error persists
The error message indicates a Graph missing scope permissions for the request.
It does not seem possible to review these permissions as a global admin on the tenant.
There are no custom permissions for MS Teams, the settings are default for this app.