I am unable to use realms on my iPad Pro (ios 13.4 - latest) or iPhone XR (ios 13.3.1). Steps to reproduce:
Download Minecraft from app store (version 1.14.30)
Open Minecraft
Login to Microsoft Account
Click Play
Select Available Realm
Load makes it to 'Loading resource packs' and after approximately 10 minutes on the screen receives a 'Disconnected from Server' message. Clicking 'Ok' then runs a loop back to step 5.
Note, this is not a connectivity issue. Also, the 'Content Log' indicates it is writing to file that does not exist in the log directory. All that is there is a 'ClientCorrelation**.dat' file.
The same realm is accessible to the same and other users across different platforms (Windows 10 / Switch / Xbox One)