"This file has been renamed. We recommend saving it now to get the new name." When opening Excel files from WebDAV in Windows Explorer

Running on a Windows 2012 server on Google Cloud. For the longest time we have had a webDAV server set up and use Windows to map drivers to the remote server. Everything has worked normally until about a week ago, in Excel and ONLY excel (using Office365) we've been getting a popup recently that says

"This file has been renamed. We recommend saving it now to get the new name." The only options are SAVE and LATER. It happens soon as the file has been opened. The odd part is you can close out the message and go about working on it and save just fine. The message pops up any time an Excel file is opened.

The only workaround I've found is creating a new user profile and oddly enough the error went away, but the issue is starting to crop up on other computers as well.

Any thoughts?
Christopher DealAsked:
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Christopher DealAuthor Commented:
Here's a screenshot of the error.

JohnBusiness Consultant (Owner)Commented:
Open the file and then a new, blank file. Copy the contents (formulas as well) to the new file, save it under a new name and then test it.
Christopher DealAuthor Commented:
I'll give that a try when I get a chance. However, this happens on EVERY single Excel file we open. (ones even created years ago).
JohnBusiness Consultant (Owner)Commented:
Thanks for the update. There appears to something wrong here as that is not normal at all. Is there some property of your server doing this?
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