I found that I can initially get “access key not detected” on the first star button if the key is not there*.
On the second push I get “access key disabled”. Perhaps a warning to a would be thief.
When you insert the key into the car it works normally.
*I’ve had situations where I wanted to leave a key in the car in the ignition and not disable proximity. A homemade faraday cage works.
Noodles around the switch
In altoid metal case
A Mylar bag (in which a charge card is sent)
More foil around. (I only found foil and Mylar wasn’t 100% effective, so I added the box and foil outer layer for good measure).
Hide the key, perhaps not in the glove box or central storage bins.
I will report back if this is not very reliable.