Help for a friend on a realm (console)

My friend joined a realm that I was in and has all of a sudden lost all ability to interact with anything.

He can load in but can't pick anything up, use anything already in his inventory and when he moves around the map his character just stays in the same place to everyone else.

What's been tried (and not worked) so far...

Hard reset of the console. Router has been checked for connection problems, none found. Minecraft has been uninstalled and reinstalled.

Is it possible for the realm host to remove and reinvite him? As this is all we can think of that hasn't been tried? The host is our friend but can't get on until tomorrow.

Any help would be great.