My new chime arrived and went through the same setup as before with the same result, the chime setup failed on the last step. However, I was able to get the chime to work after some experimentation. Here’s what I did. Note some of these steps may not be necessary but I put them here just in case.
* Used an extension lead and plugged my chime into it so the chime was on my doorstep close to the doorbell.
* plugged my router into the extension lead and placed that on my doorstep as well so it was close to both my doorbell and chime.
* Switched off the 5ghz wifi option on my router and then restarted. This was just in case for whatever reason the chime on normal wifi couldn’t communicate fully with the doorbell on 5ghz wifi.
* Restarted the router.
* Went through the chime device setup using the app. When prompted to join my home wifi which it had auto selected chose not to, instead selecting the same wifi from the list displayed so it forced me to enter the wifi password (just in case there was a problem with the stored password).
* This time the device completed the setup correctly and I verified it worked by ringing the doorbell.
* Moved the router back to its normal location and switched 5ghz wifi back on again.
*Moved the chime to the preferred location in the house and restarted the router again. The doorbell connected to 5ghz wifi, the chime connected to normal wifi and all are working as expected.
Seems that when setting up the chime it must be very close to both the doorbell *and* the router, ideally within line of sight to both and within a few feet.