New with UmbrelOS. problems with nginx proxy manager

Hi. When defining inverse Proxy and try to finish setting up a certificate with SSL forcing it doesn´t work and respond with INTERNAL ERROR. So I am unable to set any app within Umbrel ecosystem because it needs a secure access (https) which it has not been able to be created previously with Nginx as I said before.

If somebody can help me …

I must add that I use Movistar Router Smart WiFi 6 Go, and Umbrel 1.7.2.

Thanks, JC