How to Share Google Domain Access

To share management of your domain:

– Sign in to Google Domains
– Select the name of your domain
– Click the menu icon on mobile, or view the links on the left side on desktop
– Click Registration Settings
– Under Domain Permissions, click Add User
– Enter the email address
– Confirm you added the user

The person you are sharing with will receive an email notification with a link to log into Google Domains

More info: https://support.google.com/domains/answer/7179397?hl=en