For me, after I clicked on the Results button I got a picture of my passport with a green border, which meant that I had passed the health check.
Seems like you are not the only one having trouble.
Unless you are required to specifically show the Health Kit app, I would use your mobile phone providers QR code to get a Green Pass. Most communities and police stations have all 3 QR codes for the 3 mobile phone providers.
What happen after you click on Result. Mine says it havent feedback and try later. I dont understand what is this and what should i do next.
The instructions for the Health Kit app are almost correct. For me, on android, to take the picture, clicking the camera shutter button caused the app to exit. To take a photo, press the Results button at the bottom of the screen.