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

This has been fixed. go to account>update.

This did not work for me.

I went into settings, searched for Web Credentials and found both Web and Windows.  There are no entries for Office or OneNote even though I have both.  I expanded the numeric credentials in both panes and they were for skype and messaging.

I also looked in control panel and got the same thing, of course.

It could be me...

To add to everything which has been said, I noticed the additional information in my environment:

Environment:

• Work computer joined to a domain
• Office365 ProPlus installed, latest version (1707)
• OneDrive for business configured with work account (O365 account)
• OneDrive personal configured with personal Microsoft account
• Logged in on the computer with the work account

The pop-up issue only occurs for files updated in the personal OneDrive.

Hello,

It seems it's related to the latest office update (1707). At first I thought it's from my new laptop, but then I reproduced it on my home computer. Judging from the timestamps of the posts here - the issue started in 1707.

To the tech support questions:

1. Is the issue specific to one file or with every Word file? - every word file. Keep in mind the issue does not trigger each time.
2. Have you checked if your Office application is updated? - Yes, 1707.
3. Are you signed in to Office? - yes.
4. Have you associated your Microsoft account with Office? - yes

Observations:

* It only occurs in files stored in OneDrive, not in local storage.

* It occurs seemingly random (to my knowledge). Only when trying to save or exit a file.

* So far only Word and Excel files. Not occurring with Outlook and OneNote.

* It does not prevent saving. Saving works normally.

Obviously another Microsoft regression problem.  Need a developer from MS to look at this.