I can't join any server or multiplayer world its only loading

I am expecting help from Microsoft agents

Pls can any agent help me

Make sure you are doing the following:

Multiplayer Options

Minecraft (Bedrock) supports the following multiplayer options:

• Locally hosted multiplayer world via LAN or Xbox Live
• Realms
• Servers (unofficial, third party server software)

Locally hosted multiplayer world via LAN or Xbox Live

Any world can be a locally hosted multiplayer world, and accessible to other
Minecraft players.

To start, create new world or load an existing one. Then, select World Settings (pencil icon) →
Multiplayer → Multiplayer Game. If all players are on the same local network, you may also toggle on
Visible to LAN Players.

Other player(s) can join the world by navigating to the Friends tab and selecting the world.

Do you get an error message when you're kicked? When does it kick you? How long are you in game before you are removed? Have you been able to play together before? Does this happen when either of you are hosting the world or have you only tried one hosting
the world?

Do you have any issues joining other multiplayer games?

And to clarify, I can't remember if Astroneer supports it, but is that split screen or are you talking about online multiplayer?

No I do not get an error message It just stops saying loading solar system or crashes. It kicks us when we are loading. We stay in the game (loading I mean) for about 20 seconds then it just kicks us. Yes we have been able to do online with each other before.
I can join his saves but he can't join my world.

I should mention most players are joining my world without any problems, but a few have gotten the "Connection to the server was lost. Exiting to the main menu" message and can't join. I can't join there world either. My NAT open and my connection speed
is fine so I'm not sure whats causing it.

From Minecraft/Microsoft -

https://minecraft.net/en-us/article/minecraft-multiplayer-server-safety

“Join Multiplayer Games” Settings
If you have your settings set to block joining multiplayer games, you can’t join any multiplayer games in Minecraft, including shared local worlds, Realms or servers. To enable multiplayer in Minecraft, make sure this setting is set to ‘Allow.’

However, just like ASCllnaut, that setting was already turned on for my children. In other words I'm in the same boat, we can play on the LAN but not on a realm.