Today, we’ll talk about this error:
So, the Microsoft Remote Connectivity Analyzer is a great tool to help us with errors inOffice 365 among others things.
In this case, I researched a little and found it the KB 2650717. The Microsoft said to check and rebuild the federation trust.
Other thing you need to check, is the Federation Server Proxy. Check the health and the metadata. To rebuild all the ADFS and ADFS Proxy, we have already written a post here, talking about how to delete ADFS.