GeyserMC, the plugin that lets bedrock players join the Minehut server, needs an update. This plugin is found on the main Minehut server, not any of the player-created ones. The one on the Minehut server supports bedrock players that are in the version 1.16.200. Any players with the latest release (1.16.201) cannot join.
Because this plugin is already on the server, I assume that you don't need a link to its site. Just in case though, here it is: https://geysermc.org/