Only player 1 is being logged into Xbox live for achievements/ ownership of ender chests etc when multiplayer (2 or more on same device). Players / Nintendo Switch Users (also linked to Xbox Live) will not see their ender chest / spawnpoint when they want to join my game from other device.  Need each joining player on same device / Switch to be able to also log into Xbox Live when joining my game.  I am player 1 kids are players 2,3 on Switch.  Player 3 exits game, goes over to PC, opens Minecraft, joins my game and they are seen as a different player. (4) for example.  Only while they are on same machine, their ender chests are holding their stuff.  When they go to PC or tablet, their ender chest is not carrying over what they put in it when they were on controller 3 on the Switch.