In the 1.19 Java Edition updates, a mechanism for reporting player chat messages to Mojang was implemented. Bedrock Edition does not support this reporting mechanism. If your server or proxy settings require that every player joining supports this mechanism (which may be enabled by default), Bedrock players will be unable to chat.
Server administrators can disable this setting, but please note that Java players can join with certain mods that make their messages unreportable.
For a technical explanation of Java’s chat signing system, see this article.
Vanilla, Spigot/Paper/forks, Fabric
enforce-secure-profile: false in server.properties
BungeeCord and forks
enforce_secure_profile: false in config.yml
force-key-authentication = false in velocity.toml
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