Hi! Could you kindly try logging out and logging back in again? If that doesn't work kindly try reinstalling the app or using a different browser (Chrome, Firefox).
I tried to add friends early in the morning when I wake up, found all of them in few seconds..
Yesterday evening, it was impossible.
Seems the server are too busy with the pandemic.. Take care guys.
@thunderstorm_rulz@Piw@administrators@Developers I was just about to congratulate the developers to fixing this bug. For me at least, this has not happened anymore since the last update. But now it seems, that was just a lucky coincidence. To bad.
@Administrator I have not been able to play in any online matches for the past few weeks. I am unable to get into custom match, and am not able to click into auto match on the basic game. It will only allow me to play single player. I have tried on the browser version, the desktop app version, and the mobile app version and none of them will let me play.
the developers to fixing this 
bug. For me at least, this has not happened anymore since the last update. But now it seems, that was just a lucky coincidence. 
To bad.
many times to find 2 opponents for dragon fight game... and during we put cities, game was cancelled .... thats so boring