Failing to connect to Google cloud FW

Hello,

You may try to check the troubleshooting steps as outlined on this RR:  Sophos Firewall: Troubleshooting site to site IPsec VPN issues 

Additionally, you may also refer to this past community thread which might be a similar case to yours: https://community.sophos.com/sophos-xg-firewall/f/discussions/147812/site-to-site-vpn-authentication-on-reboots---change-psk-works#:~:text=The%20Sophos%20VPN%20logs%20show,the%20PSK%20on%20both%20sides.

Regards,

Thank you Raphael, let me try and revert.