Looking for Fortnite friends?

I liked Fortnite again a few days ago. So I downloaded the game to my phone and tried to find my friends' accounts. But whenever I want to search, "Search failed" is displayed.

I need help with that

There's generally little that can be done, because to add friends you need their name spelled exactly right. If you have no contact with them to find out their name, you can unfortunately no longer add them…