The first thing you have to do is press the Options button> choose "ONLINE" in the pause menu
If the above did not work, you will have to make sure that there are no pending game updates, for this you will have to press and hold the PS button> access Return> press the Options button> access "Check for updates" and install if there are any some update available.
You can also reboot your internet modem / router or modem and hopefully the problem will be corrected or you can try using another internet network.
In case nothing works, we recommend that you wait a bit, the game servers may be offline, and you have to wait a bit until they reconnect.
That's all you need to know about how to fix Unable to connect error in Returnal, we hope that our guide has been as useful as possible and you managed to establish connection without problem.