Doorbell is only used perhaps once a week , noticed that we had missed a couple of deliveries and turns out it suddenly stopped sending the call.

Chimes still ring.

detection and everything else still works 

we have 2 x iphones connected to the one account , and both stopped at the same time .

Now coincidentally we have both recently perhapos in the same time scale have upgraded to IOS 26 .........

Done everything online in terms of checks as recommended by Tapo .

Reset Unit .

Deleted App. 

update : After probably 2 hours - it appears that by enabling just 1 notificaion that this enables the doorbell to work which seems completely illogical , anybody else have the same thing ??