Halo 5 Forge PC Problem

I can play the tutorial just fine, but when I try to play Forge on the ‘Build’ Option, it says my network was disconnected or something. But my Internet is still on.

I am having the same issue. Using the search in “Featured” works to look at all the stuff people have created and the tutorial works and can be played through as well. I have Halo 5: Forge whitelisted in windows firewall for outgoing and incoming connections, with no other firewall running. All other programs connect just fine