Thanks for reaching out. To change your email address, you would need to still have access to the Nest Account that you want to change the email address. Please follow the steps below:
You can also click on this link to learn more about this.
I just wanted to jump in real fast to see if you saw Edward's reply and to see if you still needed some help on this or if you were able to get it sorted out. If you are still needing some help, just let us know and we'll be happy to continue helping.
Do you not have access to the old email at all? When you say it's not active, was it something like an ISP account that you no longer have an ability to reach? What's the reason you can't use the old email address?
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.