Your RPi’s firewall settings likely don’t allow pings. If you can ping in one direction only, that means that the connection works in both directions because a ping requires both sending & receiving a packet in order to get a result.
I connect the RPI to the Wifi of my phone (in 4G/5G) : no ping issue at all
I connect again the RPI to the 4G key : same problem : if the PI don’t ping the computer, computer can’t see the PI.