If you are a Java Edition PC player, you cannot join the Realm of a Bedrock Edition Xbox Series X or PC player, for example. Another point to note is that Minecraft Realms - for either Java and ...

Realms are also an option for Minecraft PE, Bedrock, and Java players to join their friends. This must occur through an invite; if the host doesn't request the player to join, it's not available.

Here's how to join the MCC Island server: With Java Edition 1.19.4 open, click the multiplayer button from the main menu. Press the add server button.