Same issue with the AM3. The problem is that if you use the ASI Mount with ASCOM drivers, it seems bluetooth is not syncing local time and location.
The workaround I found is either first connect it using bluetooth in ASI Studio, this will sync the local time, then connect to NINA with the ASI Mount program. This should work.
Otherwise, I'll use my mobile to connect to the mount WiFi and use the ASI SkyAtlas app to connect to the mount, then it will sync the local time and location, and connect to the mount using bluetooth with the ASI Mount program and NINA.
I also opened a ticket for that, but didn't get a satisfying answer yet.