No internet with self hosted Wireguard VPN on Cloud VM

I setup a Wireguard VPN server on a Google Cloud VM but when connecting to it with the iOS client (running latest OS and app) nothing loads via the internet when the VPN is on (no browsing, emails, social media, etc), as if I don’t have an internet connection. What could be causing this, or how can I troubleshoot? Note: I am a beginner, and apologize if I am using incorrect terminology, feel free to correct me.