I'm trying to troubleshoot an issue for a friend of mine.
MS Office is installed on their PC (Windows 10), downloaded from their Office 365 account. When they attempt to sign into their office account in MS Word or Excel, it does not sign in. The authentication seems to be successful - it asks for their email address and then their password but then closes but it continues to display the 'Sign in' button on the Account panel in the File Menu.
I've tried logging in with my Office 365 account and it works okay. It displays my details correctly. I even had my friends colleague log in to her MS Word and it showed her details correctly.
I've had her reinstall Office twice, with no change. She can log into Office.com fine and use Office 365 online fine as well. Is there anything else I can try to solve this as it is causing problems for them when editing her business's sharepoint files (it prompts for authentication every single time)?