Mainly there is 2 main reason to cannot join a server.
1. If you are a Bedrock edition player then you cannot join hypixel or herobrime server
2. If you are a Java edition player then you cannot join Nether gamers server
The bedwars server that is only made for java players can only be available for java players.
In the same way, the server which is made for Bedrock players can be for bedrock players only!
If you are a bedrock player then you can't join TG or Techno Gamer Server. TG server is only made for java. You can play Java edition by TLauncher.
