Battery Doorbell

Hey folks looks like my battery doorbell has bricked or something?
Said off line, so I rebooted my Homebase & no probs, blue light, all fine.
But I’m getting nothing from my doorbell, I know it didn’t need charging, but I charged it a little, non the less & it’s still doing nothing?
It doesn’t beep when I press the back sync in?
Any clues?
Is there a reset button or anything?
Thanks in advance.

There’s a reset on the app. You can unpair and then pair to the homebase. The homebase I think has a reset.