Ring doorbell 3. Cannot connect to wifi at set up

Just bought a ring doorbell 3.not impressed.
Cannot get any connection to wifi.
Have a strong wifi signal in all rooms.
Have tried resetting doorbell.
Have tried on ios and android to get connected.
Have tried switching off mobile data.

Nothing works.
Deeply frustrated as have several smart appliances and no issues.
Checked strength of signal and is excllent.
I am at a loss.

Hi @Lostweegie. I appreciate you going through those troubleshooting steps. The only other troubleshooting step I can recommend is to use our Help Center article here to check if you need to change any router settings to get your Doorbell to connect. If you have tried this step and are still having the same concern, give our support team a call at one of the numbers available here for further assistance. If you are outside of the US, please visit here to see how to contact support.