Some ISP’s may block port 80/443 and other ports such as 445. Check another port and see if it works.
I checked with my ISP and you’re correct port 80 was in fact blocked by them. They said that 443 was not blocked so I tried that. Same results. On the app I tried using my ip that I got off whatsmyip.com with and without the :443. Same result. I just read that I can unblock 80 since I subscribe to a higher package deal, but I’ll need to be on my home network to make the changes. When I get off of work I’ll give it a try and post my results. Thanks for your help.