my brother cant get into my friends realm.

my friends started up a Minecraft realm recently so everyone in are friend group could hang out and chill. Originally we all got into the realm, but we wanted to change some of the settings later on. Do to that, we ended up running into some problems.
So to fix those problems we ended up downloading the world and uploading it on a new realm by the same host. After that everyone else got on fine except my brother. even though the host was whitelisting him my brother was not receiving any invites to the realm
and after we tried that a couple times we just decided to give him the realm code. but unlike the last realm we had were if they had the code they would instantly be added in, this realm says that it requires permission from the host. yet the host says that
he doesn't see anywhere to accept him and that the host's earlier whitelist was still pending. we have no clue at this point what to do because neither the code or the invitations(though the envelope) are working for him.

:)