Connectivity problem when using home network.

I have a realms server I have created on Minecraft for Windows with 2 of my friends. Everyone on the server has moderator previliges.

 

One of my friends joins the world and we can see his character at the spawn point but he does not move or do anything on our screens. Meanwhile on his screen he can freely move but cannot interact with anything on the world. 

 

The said issue has been solved by switching to the cellphone hotspot but he cannot use his home network. The said network is not the issue since he can use it without a problem for discord and other games.