Same problem. Tried every troubleshooter suggestion including closing and reopening realm, changing order of joining, switching realm worlds, closing and reopening app for all users, signing out of microsoft and re-logging. All 3 players were on PS5 version of the latest edition of minecraft. The first 2 could always join, the third would insist the realm was full. Realm was working perfectly before the Tiny update.
Same problem. Tried every troubleshooter suggestion including closing and reopening realm, changing order of joining, switching realm worlds, closing and reopening app for all users, signing out of microsoft and re-logging. All 3 players were on PS5 version of the latest edition of minecraft. The first 2 could always join, the third would insist the realm was full. Realm was working perfectly before the Tiny update.