No longer able to join multiplare with my son's android 7 tablet

We could connect to each others multiplayer games pre 1.16.101 update.

i am also looking into the ios update performed at the same time.

i can join realms,

i confirmed that both devices are on the same network

test on my phone's hot spot.

uninstalled mcpe on the android.

currently  get the cannot connect to world error when trying to connect from either devices.

thanks