When I trying to join realm server I want via invite code or link I always gotten the “Realms Error” screen and this happens on both my iPad 9th generation (iPadOS 17.4.1) and iPhone 8 (iOS 16.7.7) even though my internet connection is good I still got this issue. Trying to fix this restarting my tablet/phone but it didn’t help, but the realms I already participated in  - I can freely join and didn’t have any issue with them.