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Port forwarding with BT Smart Hub and BT Whole Home not working

I have set up NAT to forward port 443 (for testing an HTTPS  Web app) to a computer on my network exactly as described here:

https://www.bt.com/help/broadband/learn-about-broadband/how-do-i-set-up-port-forwarding-on-my-bt-hub...

The device has a static IP, Windows Firewall turned off, and no other firewall running. In BT Smart Hub Manager -> My Devices, the device shows correctly as having this static IP, with an icon to indicate that port forwarding is enabled. Details of the port forwarding are also correct. In Home -> Advanced settings -> Firewall, the Firewall is Default (not Block all or Disabled). The computer is not in the DMZ but I don't think it needs to be (perhaps I'm wrong about this).

Trying https://<my Home Hub Broadband IP address> from a mobile network (which should return the same as https://localhost from my computer) times out. Further, there are no open ports found when scanning the IP with an external port scanner such as https://pentest-tools.com/network-vulnerability-scanning/tcp-port-scanner-online-nmap.

I am not sure that the link is even reaching my network, since neither this external port scan nor trying https://<my Home Hub Broadband IP address> in an external link check generate an entry in the Home Hub Event log (Home -> Advanced settings -> Technical log).

My BT Smart Hub is a new model (sent by BT in Jan 2020) and firmware was updated on 19-Mar-2020. The computer is connected to it via Wi-Fi over BT Whole Home mesh networking.

Any ideas on how to fix this gratefully received. Thanks.

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