Nest Doorbell (wired) chiming but not blue or yellow light under lense. Power to doorbell but won't.

[BeckyB92]

I am in the UK and have had a nest wired doorbell fitted. We have power to the doorbell and it will chime when the button is pressed. However there is no blue light under the lense or any other lights other than the charm button light when pressed. I am unable  to connect the doorbell to my home network. Having looked at another community thread, this suggests that the doorbell is faulty. Please can you advise. Thank you. 

[MplsCustomer]

@BeckyB92 

I'm just another Google Nest customer, and we have 1st gen Google Nest Hello Doorbells, so I don't know whether this is relevant to your case or not, but Google Nest supports the 2nd gen Google Nest Doorbell ONLY in the United States and Canada:

https://support.google.com/store/answer/2462844