Syncthing won't connect to a new device across the Internet

Hello there. I’m a bit new to syncthing and am trying to connect to another user across the Internet. We both put in our keys and restart but no connection request popped up on our ends. Is this even possible? Thanks.

Currently, at least one of you will have to open a port in your router, to be able to connect. Either with UPnP (needs to be supported and enabled in router) or manually.

Future versions will support relay servers.