This part is probably the biggest disaster there is! I would try to return it! No data transmission, inaccurate etc.! Does not work and is very disappointing!

You're just better off throwing it in the recycling bin, so you don't waste any more time and get annoyed! (I say this following my experience with two of these Trackers)

Hello, the tacker doesn't always work as it should for me either. It is only accurate from time to time. Some time ago, it not only showed the street, but also the house number, which was very good. That's how we once found the lost tracker. But now the location is only approximately given. The advantage is that the device is small, but I probably wouldn't buy one again either.

The tracker works with the Swisscom LPN LoRaWAN, s.
https://www.swisscom.ch/de...
If the signal coverage at your location is poor, the tracker cannot communicate. Check with the map!