When I wanted to play Fortnite, I started it in the launcher and in the Fortnite window I had to log in again. I did that, but then I got an error message "Logging into Fortnite servers is not possible, try again later." Then I kept trying, but it still did not work. Even after PC and router restart it was not.
'' Try again later. "…
Yes great, I tried it a few hours ago and also yesterday, but then the same thing came out
Should you have had to write about that; Lack of information to give a good answer to your question. Well, it's best to call Fortnite support when the situation is the way you describe it.
Check your internet connection. If it does not work log out again and then sart it again. If not, try again later. LG Nico