Add a Domain Manager
On Google Domains
Go to your registrar dashboard on Google Domains. You can go there by clicking this link: https://domains.google.com/m/registrar
Click on the domain that you want to add a manager to.
On the left hand menu, click Registration Settings
Under “Domain Permissions”, click Permissions
Enter the email address associated with the person or organization that you want to manage your domain. If you want Scalebloom or TradeThrive to manage it for you, enter firstname.lastname@example.org
Then click Add.