Not Able To Access IIS Web Server Externally

I have been testing my IIS web server for 3 days. I am able to access the website internally through the internal static ip address 192.168.1.201 from different devices on the network. I have setup port forwarding on my Verizon router to forward all incoming requests from the external public to the internal port 80 on the Windows 10 desktop where my IIS server is sitting. I have completely turned off all firewall settings on my Windows 10. I also have completely uninstalled all anti-virus applications. Even after having all that doors opened, still every time I access the website through using the url  http://public-ip-address:port# I got the "This site can't be reached" message. From the public, I have no problem accessing port 80 of other devices that are connected to the same Verizon router. So, clearly there is either something wrong with my Windows 10 or the setup of my IIS server. Or it could be that the router has trouble forwarding the port. I am just guessing. I don't know. It has been 3 days and countless hours, but I am still not able to find any clue to why this is happening. Could someone who has been through similar situation help me out?! Thank you for all of your help!