@Denapie
You could contact Support, but I don't know if they can help you.
Google Nest says: "If you plan to get a new phone number and stop using your old one, you should turn off 2-step verification before you deactivate your old line. Then you can turn 2- step notification back on with your new number.
Important: You’ll need to enter a verification code from your old phone number one last time. This is a security precaution to confirm your identity and help protect your account."
https://support.google.com/googlenest/answer/9295081
To contact Support:
1. Go to https://support.google.com/googlenest/gethelp.
2. Select a category/product family, and type in a brief description of the issue, then click "Next".
3. Select your device from the dropdown, click "Other", then click "Next step".
4. Under "Resources", just click "Next step". (Clicking one of the listed links will bring up a Help page.)
5. Under "Contact options", choose to get a phone call or chat with the team, depending on availability in your country.
