Can't play any PC games online

A couple of months ago it was fine and I could play online but after I got new internet(BT infinity) only my PC can't play games online(my switch and xbox work). I have been trying to play games like arma 3, rust and cod WAW. I keep getting errors like "steam authentication failed" and "lost connection to host" and "timed out". I have tried disabling windows firewall but nothing works. What could I do?

Poor latency? My mb/s average is above 25 and I have low ping

A couple of months ago it was fine and I could play online but after I got new internet(BT infinity) only my PC can't play games online(my switch and xbox work). I have been trying to play games like arma 3, rust and cod WAW. I keep getting errors like "steam authentication failed" and "lost connection to host" and "timed out". I have tried disabling windows firewall but nothing works. What could I do?