Realms : 1.16.1 cannot login if another user is using 1.16.2

Many people cannot login to realms since 1.16.2 update. 

I've found if someone is using a world with a version, another client with different version cannot log in to the same world, resulting in the hang on the connecting to realms screen without any error message.

You can either use 1.16.1, or 1.16.2 but all the clients needs to be using the same version.