Solved autologin issue in Java and Bedrock using the latest version of Geyser and AuthMe.

For Minecraft Bedrock/Java version 26.20, use:

Geyser:
https://download.geysermc.org/v2/pr...rsions/pr.6271/builds/latest/downloads/spigot

AuthMe:
https://github.com/AuthMe/AuthMeReloaded/releases/tag/6.0.0-R1

Floodgate:
https://geysermc.org/download/?project=floodgate

and the latest version of FastLogin Update.

Remember to set the following settings to "TRUE":

In FastLogin Update, set to true:
autoRegister: true
switchMode: true
premiumUuid: true
autoLogin: true
autoLoginFloodgate: true
autoRegisterFloodgate: true
nameChangeCheck: true

In AuthMe, set to false:
usePreJoinDialogUi: false