I am writing an ASP.NET web app that implements a webhook accessed from a remote location over SSL.
I am using a virtual domain from the no-ip.com service as the address of the webhook. The domain has a No-IP Vital Encrypt DV SSL Certificate.
I have set the external service to use the webhook url https://mydomain.hopto.org:41799.

On running the debug app over https from Visual Studio, the browser cannot reach https://mydomain.hopto.org:41799/swagger but it can reach https://localhost:41799/swagger/

On triggering the remote service to call the webhook, a port listener shows a client connecting and disconnecting but the call is not successful.

The app is running on my home computer so I have forwarded the relevant port (41799) on my router to my computer. The port has been opened in Windows Firewall. I have imported the .pem certificate file to the computer.
In the launchsettings.json file I have updated the applicationUrl to include https://mydomain.hopto.org:41799 as well as https://localhost:41799

I guess I am missing something to make allow https call to the app via the virtual domain to negotiate a connection but I am all out of ideas.

Thank you for any help you can offer.