Can't login via facebook

Hi,

I’ve sucessfully created an account via my Facebook account, and created a server with it. After a few hours of game, we all disconnected. To relaunch the server, i’ve tried to connect to my aternos account. But when I try to connect via Facebook, the website redirect me to the creation of a new account !

The site tells me that the username is already taken if I try to enter the former one.

Could I get my account back ? (Or just get the map, so i can recreate another server ! )

My account username is : Tigreed

Thanks !

Yes, i followed all these step but still nothing.
And I'm sure it's the right account, because when I try to create a new one with this facebook, it says that this facebook is already use.

Could I just have the map ? I think it will just be easier

Then I click on the facebook icon and I got this :

(Sorry for the response delay, I was sick)