QAID # 16584 Published
Question / Problem:
Why is SharePoint Office 365 unable to log in to the SharePoint 365 server?
Answer / Solution:
Assuming all of the other settings are correct, it is possible that the Windows Identity Framework has not been installed.
It is recommended to download and install this component from Microsoft:
If still unable to connect after installing the Windows Identity Framework, rebooting the machine will usually remedy the problem.