One possible cause is that the "chime puck" is not correctly wired (or is defective; a few defective "chime pucks" have been reported in this forum). See the diagrams on this Help page:
@Bceballos thanks for reaching out. I know where you're coming from when you say your Nest doorbell won't stop ringing. To confirm, have you tried double checking the chime puck? Do you have the battery or wired type of Nest doorbell? Try to perform a simple restart to your Nest doorbell.
Keep us posted.
I appreciate the help, MplsCustomer.
Hello!! Ebedia, I have the wired version, yes I've installed the chime puck, how can I restart the Google nest doorbell, I have disconnected and plug it again and still the same behavior.
Thanks for your support.
There have been several posts in this forum with the opposite problem with the "chime puck" for the new 2nd Gen Google Nest Doorbell, with many of them reporting their doorbell chime not working, and several customers have gotten replacements:
Thanks for getting back to us. I've included the link above on how to restart and reset your Nest doorbell to the factory default. Make sure it has a pulsing blue light, indicating it's ready to be set up.
Looking forward to your response.
I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.
Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.