Log in to Google Ads and in the left menu click on Admin, then select Access and security.
Click on the tab security and select allowed domains. Here for my clients add feedarmy.com or if you are using this guide for your clients, enter the domain name associated with that business.
Navigate to the Users tab and click on the blue plus icon.
Enter hello@feedarmy.com in the email field and select standard access, now click on send invitation.