The question has been answered.This might be because you have changed your minecraft username.
How to solve -
First, Log out from Minecraft ->
View attachment 134815
Secondly, you need to fill in your username and password and log in. After that, try to log in again, and hopefully It will work :)
But has it worked? I had the same issue with another server and signing out then back in didn't fix it. I would wait until he responds saying it worked.The question has been answered.
@zDutchie Lock?
Maybe take a picture?i cant connect and its say "Not authentificated with Minecraft.net"
plz fix that