Tell us the account you want to use to open _vti_rpc.

Same here. Just noticed it so presumably last update.

1. It happens the first time I open a file when I try to close it. I have seen it with both Excel and Word. Once I close the file (which saves successfully even though I always X out of the auth prompt), I don't see the prompt for that file again. It does not happen with new files, only files that were saved to OneDrive before August.
2. I have Office 365 subscription and updates are downloaded and installed automatically; I'm fully updated.
3. Yes, I am signed into Office with the same account as I sign into OneDrive, which is also signed in on my computer.
4. Yes. On this computer, this is the only account that I have ever signed in with. I recently rebuilt the computer (after I quit the job that had a different Office account).

I am on Windows 7 x64, with 32-bit Office installed (the default).

Note that if this were a real auth prompt, it wouldn't list the server as _vti_rpc, which is not a server that would have my OneDrive documents on it.

Note: I also saw this on open of a document that I just saved to OneDrive (via downloading from Thunderbird into my local OneDrive account) and opened by double-clicking on it from the Explorer window.

Did, as directed from the "German" case doc'd with MS.  Did a repair operation on Office and it's taken care of issue.  Relieved, indeed.  What a hindrance!

REVISION!

DIDN'T REPAIR .. STILL EVIDENT.  REPAIR of Office, DIDN'T FIX !!

Hello Gareez,

I just did an Online Repair as well and this did not resolve the issue, would you mind sharing what you did exactly to resolve this issue?

Regards,

Jaap Brasser