Make sure your server is on the latest version
This guide was created with the following products: Gravel Host Minecraft Server
GeyserMC allows bedrock players join your java server, follow the steps below in order to install it on your server.

plugins folder and restart the server.Network tab on the left sidebar and create a New Allocation.
/plugins/geysermc/config.yml.port: 19132 with the port you copied.auth-type: online, change the online with the value floodgate.