cannot create world, cannot sign-in to Microsoft, cannot join dedicated server

 

My son cannot play minecraft effectively on his tablet to create worlds, sign-in to Microsoft, and also cannot join a dedicated server I have setup for him

cannot create world:

step 0:  play

step 1: create new

step 2: create new world

step 3: create

--> There was a problem loading this world

additional information: the worlds list is at first empty. After the attempt to create new world, the world is listed with the following info:

My world 01/01/70 0.01MB

clicking on edit for the world, ends up deleting it from the list (probably from the device as well).

cannot sign-in to microsoft account:

step 0: sign in

-> failed to login

we tried to sign in to your microsoft account, but something went wrong

 

additional information: I logged in to https://www.xbox.com/ with his account from another machine. the attempt was successful. The account is not disabled, or locked and the password I have for him is correct.

cannot sign-in to microsoft account:

step 0: Settings

step 1: Profile

step 2: Clean account sign in Data

step 3: Sign in for free!

step 4: Sign in for free

-> signing in with your microsoft account [*hangs* with equalisers moving]

 

cannot join dedicated server:

step 0: Friends

step 1: Lan Games/Dedicated Server [bedrock level - v1.16.200.  1/10]

step 2: Online play is not rated/Proceed

step 3: you need to authenticate to microsoft services. Ok

-> Connecting to multiplayer game [*hangs* with equalisers moving]

connection timed out. Unable to connect to world

additional information: on another tablet, for another profile, I successfully log in the the world on the dedicated server.

 

additional information:

joining a session from another player currently playing (e.g. not a dedicated server) works. so he plays with his sister whenever she plays minecraft, he joins her game.

 

I have tried removing and re-installing minecraft on the tablet, to no affect.