Annoying sign-in box never stops popping up

[btse1]

I used to work for a firm that uses Office 365. Probably Office 365 for Business. When I left I asked them to delete me as a user of their Office 365 suite. I then purchased my own license for using Office 365 at home.





Ever since, I get a pop-up box asking me to provide a password to get back into their system. However, that password was disabled by the firm -- it is no longer valid. If I "x" it out, it immediately pops back up. I think the pop-up is somehow related to Office 365. The popup will not go away -- it is there whenever my computer is turned on. What can I do to get rid of it? Any help greatly appreciated.

[spillerbd]

It may also be OneDrive association...
In an Office application, got to File, Office Account, and Switch Account or Sign Out and then Sign in using the credential associated with your new At Home Account.
You could do a full uninstall of Office. Sometimes you may have files still associated thru OneDrive (the old business account, that will ask for password.