Hi @jorgegti,
I’ve done some testing and I cannot add the PiFace extension via the Android app since the ‘Add Sensor’ button never becomes active when adding it, which looks like a bug that I’ve submitted to be fixed. I’ll update this thread when I’m aware of a fix in place.
In the meantime, you should be able to add it via the web (and it sounds like you did last week). Are you saying you also cannot add any sensors to your raspberry pi from the Android app? If so, which sensors are you trying to add, and what is the issue when trying to add them? (‘Add’ button inactive, error message from app, etc…)