11 thousand sync errors!!

Hi everyone,

I've been struggling with an issue in Onedrive for the past couple of days. I think (but can't be positive) that it started when I tried to 'free up space' on my desktop PC. Since then a large number of files have been flagged with a red "x" with the error message that "the name or type isn't allowed". The files in question range from .pdf to .docx, .stl, etc. There doesn't seem to be any obvious reason why I'd suddenly get this message, and none of the files contain restricted characters. Also, I can download the files without issues, and that seems to clear the 'x'. I guess one solution is to go through and download all these files, but there are 11k such files. Yeah, hoping for another solution.

To date I've tried pausing and unpausing the sync; unlinking and re-linking my account; deleting the cache files; deleting and reinstalling Onedrive. Onedrive was also crashing regularly, though reinstalling seems to have at least fixed that for the moment. For what it's worth, I'm also syncing to my laptop, without issue (though won't be 'freeing up space' anytime soon :) ). Everything also seems fine online.

I guess I could just leave it, as the files do seem to download ok, but this feels really flaky and I'd really like to resolve the issue.

Sorry for the long post, and thanks for any advice anyone might have.