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We’re seeing the exact same error message here.
In our environment, multiple PowerApps and user accounts rely on the same setup—dropdowns populated from Excel data stored in a user’s OneDrive. The error occurs universally, except when the app is launched by the owner of that OneDrive.
Like others have already done, we also verified the Excel file permissions. Everything looks fine: users can access the file directly without issues. However, as soon as we go through PowerApps, it fails.
This strongly suggests that the issue isn’t tied to a specific account configuration, but rather to a global setting or variable that has recently changed.
After some additional tests on a new application, it seems the issue is linked to the OneDrive for Business connector. I tried switching to the Excel Online (Business) connector on the same file that previously failed, and it worked correctly.
However, this is only an explanation, not a viable solution — we cannot afford to modify all existing apps and rebuild their connections.
The main question is: why did it work before, and why has it suddenly stopped working now?
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