For the last two hours or so, every time I was invited to join a party, the game said that the host was unreachable. I assumed that this was an issue with either mine or the hosts clients, so both of us restarted Warframe. When we got back on, the issue persisted so I decided to try hosting. When I sent the invite, the invitation did not even reach the player, as the game somehow thought that the player was offline. I was messaging them during the entire process, so I know for a fact that were, indeed, online rather then offline.
I could not for the life of me use your insert image