We recently upgraded to our network to the fibre over coaxial netwrok.
As part of thhis we got a free double pack WiFi extenders. I set them up acccordiing the instructions with no issues.
EXCEPT any device which is not an Apple device can not see the extension network.
Thanks for the post John. Check if the other devices can connect 5GHz as the Extenders only broadcast at that rather than 2.4GHz.