Thank you for the help!
- I did port-forwarding on the router (ports 80 and 443).
- I verified my IP address and tried to reach my FreedomBox in a browser. I get a time out.
I think I figured out the problem, though. I think my ISP (PYUR, was Tele Columbus, in Germany) uses a Carrier-Grade NAT (CGN). When I checked my router’s IPv4 address it appears to be a private address (e.g., 100...**).
What options are there for getting around a CGN to access a FreedomBox?