What finally and completely solved the issue for me was the following step-by-step sequence:
- Delete existing mobile key from the phone and the car
- 'Forget' the bluetooth connection between the phone and the car
- Reboot the pilot panel and the phone
- Reconnect the bluetooth
- Recreate the mobile key
Everything works now like a charm - the car unlocks, doesn't pester me with 'no valid key' messages and every software function works as it should.
Bravo Lucid!
Software version 2.1.47, Android 14, Pixel 6a