Does door opens if you short terminals “open”(5) and “com”(6) with a piece of wire? If so, then only option is that relay in your sonoff doesn’t activate (doesn’t click - make short). If you have a multimeter check it with buzzer.
Is there any particular reason you didn’t ask in that thread? The people that are watching that thread are all either interested. users of, or authors of the software you are using. They are likely your best resource.
Then these inputs are not active, so nothing’s wrong with your wiring, but there must be something not correctly programmed on garage door opener… try to find manual for your garage door opener and check out.