@638 Thanks, Guys. All sorted. Dicky cable.

@RamtinR Thank you for your suggestion of pinging the AP. t seems the misunderstanding lies in my mixing up the term "Mesh" with the term "Omada". You are right, I do not want to move this wall plate...

I have just installed a mesh with 2 x EAP225 outdoor. One of these is the uplink hardwired to a POE switch which is hardwired to an ordinary router. There is a TPLink hardware cloud controller also...