Any message error containing the phrase "outdated server" normally means one thing in particular – A player is trying to join a server with the wrong Minecraft game version. ... It makes joining for the player impossible as the server does not support the game client version that is trying to connect to it.

How do you join an outdated server on Minecraft?

When the server is not the same version as your Minecraft client you'll see an “outdated server” message when you try to connect. This means you need to switch to the same version that the server is on, in order to join us. The good news is, with the current launcher, it's extremely easy to switch between versions.

Could not connect outdated client meaning?

When playing Minecraft Bedrock Edition and the error appears while trying to connect to a Realms server, outdated client most likely means you need to simply update your version of Minecraft. Ideally, this really shouldn't ever happen if you play the game regularly, as all versions usually update automatically.