@brian: when using the Blynk app, you shouldn’t need any port forwarding: the way Blynk works is that the device (OG) communicates with the Blynk cloud server, sends status and receives commands from the server. Your mobile phone / app also communicates with the cloud server and so all communicates are through the cloud server. There is no need to set up port forwarding.
One thing to double check is that the Blynk token you set on OG matches the token in the Blynk app.
Setting port forwarding would be useful if you don’t want to use Blynk app, and instead want to directly access the native web interface of OG. Once port forwarding is set up, you can type in your router’s external IP address and access the built-in web interface directly. This way it doesn’t go through Blynk app.