Missing Realms "Failed to join Realm" message

I went to join a new Realm today and noticed all of the Realms I am in have disappeared from my list, except one that expired some time ago.

I joined the new realm, and I'm getting the message “Can't connect to Realm. Failed to join Realm. Please try again later."

I have been through all of the troubleshooting and nothing is working on my end.The Realms I am in are all still active and I have not been kicked from any of them, let alone all of them. My membership is still active.