A warning for all users
If you are using this app, do not upgrade to 2.0.0 firmware! This especially holds when you are using authentication with your devices. As @jkondas mentioned, this is related to the authentication changes in this major firmware update.
Have you updated already? Try the new Shelly Control app, which you can find at Shelly Control | Homey. We are working hard on making this officially available, it is currently pending review by Athom.
