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When you get the error, just wait a few minutes and the game will probably, hopefully, connect you to another player and you can finally beat that boss. I did the restarting app and modem/router fixes but I still get the error. Now I still get the error but it will connect me to a player a few minutes after.
It may or may not work for you but I tried this 2 consecutive times and it worked for me. Still need to kill the Shadow of Yharnam though.