We had the server update 1.19.40 yesterday at 5 pm EST.  I logged into my account and upgraded via Microsoft store and launched my Realm again and it worked.  I got a message at 7:43 pm EST that the server was down and checked on it again (from one of my friends who's a member of the server).  I tried myself to connect to the server but kept getting the message "Unable to connect to realm. Failed attempting to join realm. Please try again later."  I tried removing the addon and launching no joy.  I tried download the latest copy and putting on one of the other instances and launching that one.  No dice.  I tried downloading before the update and then playing for a minute or two as and then uploading it again to another instance of Realms and it gave me the same message.  I tried all this last night and this morning tried it again but nothing has changed my realm has been down for 17 hours and unsure why it even happened.