It’s been working fine for me... some suggestions:
Make sure
Blue Iris can...
1. Use battery in background: Setting > Apps > Blue Iris > Battery;
2. Access location all the time: Settings > Apps > Blue Iris > Permissions > Location.
Clear the cache...
Settings > Apps > Blue Iris > Storage.
Reset your device geofences, then reset the the app's geofence radius...
1. App > ? (Info) > Reset Geofences
2. Reboot
3. Move outside (your driveway). Wait a few minutes for the to device to confirm a good geofix (check the blue dot in Google Maps)
4. App > Home > Gear (Settings) > Geofence radius (your preference)
5. Ditto for Geofence update notifications (handy while debugging)
If all else fails....
1. Delete your device from Blue Iris: Settings > Mobile devices
2. Log back in from your device