[2022] I can't start EU4.

to the EUIV Tech Support subforum.  

Probably due to having your Documents folder on OneDrive. Are you online, is OneDrive running and syncing okay?

If you didn't actually want your Documents held on the MS servers, you should undo that move in Windows.  

Do you still get the Data Access error, in particular? Or things have changed?

Did you actually want your files tore in the MS cloud?