Since version 1.21.71, previously multiplayer worlds can no longer be entered without Game Pass. It's true that I subscribed to play multiplayer, but that didn't happen for LAN worlds. I don't know if it's a mistake or something new, but at least let them know.
MCPE-194691
Xbox: Multiplayer worlds no longer work on LAN
Reopened
11
(Unassigned)
1416834
Community Consensus
Xbox
1.21.71
1.21.71 Hotfix, 1.21.73 Hotfix
Retrieved
Still not working on 1.21.90