In the firsts realms servers you were be able to invite more than 50 people, but in these realms when you have 19 people whitelisted, and if you want to invite another user it will displays an error saying "User x not found".
MCPE-5369
Realms-Whitelist error
Resolved
Works As Intended
0
Work as intended, i just saw a tweet from Mamirm saying that the limit is 20 in the new realms server they gave up.