To give a new user access to your Google Tag Manager, you need to make sure you are an admin of the account first. Once that’s confirmed, here’s how to grant access to someone else via your Google Tag Manager dashboard.
Step 1. Login to your Google Tag Manager account
Step 2. Click on “Admin” in the bottom left-hand corner and then “User Management” tab

Step 3. Click “+” icon in the top right corner and select “Add Users“

Step 4. Enter email address, select “Administrator” permission access, and click “Invitation” button in the top right corner.

Step 5. The person you want to give access to will receive an email with a link they can click on. That’s all!
