"true" offline lan and crossplay

so ive seen that mcc now has lan play
along with crossplay between xbox and pc
is it not possible to do that together?

my brother and i are in the same house
we dont have internet usable for streaming let alone multiplayer
and im wondering if its possible to have an actual lan crossplay (actual lan as in no connection to the internet at all)

ive set both his mcc and mine to “lan” in the network settings
ive tried connecting both the pc and xbox to a router ive got and nothing
ive also tried using a separate pc and using the “netsh wlan start hostednetwork” command as a router but nope
the room still doesnt populate with my brothers xbox
any help would be appreciated

man i miss the days when games had a (host room) button