If you don’t receive any push notifications from the camera anymore, the problem might be the SSD card inside the camera. Mine was changed by the producer and now I receive the notifications.
Interestingly, I was receiving the push notifications about low battery level, but no notification about Motion detection.
The camera would make a sound as if it starts (a sound like a shutter from a handheld camera) and that’s about it, no notification was sent.
Also the battery will drain really fast, like 8 hours or so.
I tried removing and adding back the camera in the app, setting the camera to -Motion detection, Indoor 100% sensitivity- and still nothing. The producer finally found the source of the problem: the SSD card inside the camera stopped working.