Can not join friends anymore

Hello guys,

for one week ago, i had the cance to play BL TPS with them. They have the game on Steam and i have the game on Epic Games.

So I used shift, and a friend from steam too.
We never had problems, but since three days i can not join my friends in the lobby anymore.
I tried to reconnect the connections to Steam and Epic, but it not helped. We tried to invite us all, but every time i accpet the invite, it’s only a orange field left and nothing happens.

Can someone help us pls.

Sorry for my bad english.