There is a protocol update for the latest release Bedrock edition. This means older versions of the server can no longer connect.
Bedrock - Mojang Vanilla - use the Plugins and Modpack section to install the latest version
Bedrock - PocketMine - No release yet, but you can install MultiProtocol plugin which will allow players to join for now. (Contact us for assistance)
Bedrock - NukkitX - use the Plugins and Modpack section to install the latest version
We can help update your client! Just contact us!