2007~2015 Central Locking not working with Flip Key transmitter

Hoping there's some help out there - we have 2 x Flip Keys, both with new batteries, red light comes on the remote when buttons pressed, but will not operate the central locking on our 2008 CX-9 Grand Tourer.

There are 3 Keys programmed according to the PCM PATS report, we have two of them, with one 'lost'. There are no error codes when diagnostics are run via ODBII port Scanner.

The Flip Keys work the central locking manually via the driver's door.

Any ideas what the problem might be and how to solve it?
 
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