Hi,
Thanks for providing the information with us.
It seems that you are required to log into your account although you've already logged in, and you also tried logging out, resetting browser settings, clearing cookies, uninstalling and reinstalling Office and etc while still cannot solve this issue.
Given the situation, please try to clear the Office credentials and see if it works for you:
1)Quit all Office applications.
2)Clear Office credentials:
a. Type control panel at Windows search bar and open Control Panel.
b. Select User Accounts> Manage Windows Credentials> Delete credentials which contains “Microsoft Office”.
3)Open any Office application (Such as Word)> File> Account> sign in with your Office account.
If clear credentials still can’t help, please try to run Online Repairand Safe Mode to see if it helps resolve the issue.
Regarding to your issue, I’ve searched a lot, please temporarily turn off any firewall or proxy to see the result.
If the above suggestions still cannot work, please capture a screenshot of your Office version. (click File> Account> capture the full Production information page here.)
And the screenshot of the error message is highly appreciated.
Any updates are welcomed to let us know, we are willing to further help.
Best regards,
Gloria