Your nickname contains illegal characters

[jakubcze11]

What happened?

Hello, the player with the nickname Natalka can't connect to the server, it says ''Your nickname contains illegal characters'', but other nicknames like Natalka1 are fine. The player doesn't have the original minecraft, but I don't understand why she just can't get it.

10:30:38[INFO] [FastLogin] Incoming login request for Natalka from /her ip address
10:30:38[INFO] [FastLogin] Floodgate Prefix detected on cracked player

How can I fix it?

Steps to reproduce

No response

Plugin list

AuthMe, Protocolib on spigot, this plugins isn't in Bungee

Configuration file

No response

Server log

No response

Plugin version

1.12-SNAPSHOT-4dd6b9a

Platform

BungeeCord

Relevance

• I tried the latest build
  (build refers to development builds not necessary a release version; i.e. v1.10 is out of date)

• I checked for existing tickets -
  If there are, please vote them with a thumbs reaction and not create new ones

[games647]

FastLogin doesn't block non-standard usernames. It will just ignore premium modes for them. This likely an error message from your auth plugin and I assume it's misconfigured, because that name seems fine or because of Floodgate it maybe read the prefix too, which made it illegal.