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EDIT]Glad that it worked out!
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Thanks for the debug log. I note that it worked in July.
It is impossible for me to be sure but it appears that the calibre library either was a shared folder where you (as defined by the credentials given to CC) no longer have permission to see the files in the folders, or it has become a shared folder you don't have permission to see. Is this possible? Is CC logging in with the identical credentials as you use to upload the files to Onedrive?
There is also the possibility that the account type has changed from "Personal" to "Business" or vice versa since the library was uploaded.
I am afraid I can't go any further with the information I have. To do more I would need to be able to log onto your onedrive, and that isn't a reasonable request for me to make.
One suggestion that might help debug things.
- Log into Onedrive over the web using the exact credentials you use in CC.
- Create a new folder in Onedrive
- Upload your metadata.db file from your local calibre library (make sure calibre isn't open) to this new folder.
- Connect using CC. Navigate to the new folder.
If CC thinks that the new folder is a library then we have established that there is something strange about the current library. It might be necessary to delete it then re-upload it.