Hi @GraniteStateColin
Thanks for your sharing here. Maybe you have enabled the files on-demand feature before.
By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others.", and according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:
Issue Symptom:
The account was unlinked in OneDrive client, but can not delete folders from local OneDrive folder. The error message is: Error 0x800816A: The cloud file provider is not running.
Solution from GraniteStateColin:
- From command prompt, navigate to the top of the OneDrive folder
- Clean-up all the non-downloaded files via: Run: del . /s /q
- Try to delete the folder. If this doesn't work, even though nothing appears to be using it, restart and try again
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