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This is happening to me too recently. It happens every time I go to copy text in Word. It appears right after I right click and select copy. It is really annoying. I thought it might be a phish so I just delete it. It sounds like a problem with a recent update now though. The screen shot elsewhere in this discussion is exactly what I see. Of note I copied this to paste elsewhere and the message did not appear so it might be restricted to Office.
Since customers confirm the issue has been resolved by updating Office to the latest version, I'd like to make a summary which will benefit other community members who can quickly find the useful information.
Open Word 2016 on Windows, select the text, and then right click it to choose Copy, the following message pops up and ask us to sign in to open
Update Office to the latest version: Open Word or other Office clients>File>Account>Update Options>Update Now.
If the issue persists after updating Office applications, please let us know or start a new thread with the screenshots of the Office application version (Go to File > Account, capture a screenshot about the information under Subscription Product and Office Updates)
We have engaged the related team to investigate this issue. We will continue to monitor the progress and share the latest status here. Currently, please try the following workaround:
1. Press Ctrl + C and Ctrl + V.
2. Sign out all the logged in accounts, clear the Windows credentials, and make sure you are not connecting to online service. Here are the steps:
1) Open Word, click File > Account > Sign out under User information.
2) Clear the Windows credentials: go to Control Panel > Credential Manager > Remove the Windows Credentials (e.g. MicrosoftOffice15_Data:xxx or MicrosoftOffice16_Data:xxx). (NOTE: This will remove your stored passwords.)