A family of Microsoft word processing software products for creating web, email, and print documents.
This isn't a solution but what I've found is if I just click the Ok to dismiss the error, I can then click File, Open, then click my OneDrive - Personal location, then scroll down and I see the "Document 10" that it created. You can also sort the list by Date Modified to have the newest files at the top.
I'm sure this will get fixed eventually.