I have a client who uses a Windows 7 machine. I recently implemented for them Office 365 Business Premium and setup all their machines to use office 2016. However, for one of the users, she keeps getting requested for the username and password whenever she is using MS Word or Excel. She will input the password and immediately she closes it, the password request will resume again. I went online and alot of blogs said I should go to credential manager and delete any Office 2016 credentials and set it up again, this has not helped the situation.
This doesn't happen for outlook, for some reason, it is okay.