To gain Content Builder access, an Admin must grant you the access to users, here's how. As an admin:

Step 1. Go to 'Audience'.

Step 2. Select 'View user details' under 'Actions' by a user.

Step 3. Click on the top right hamburger menu and select 'Grant CB access'.

Now the user can access Content Builder, make sure to send them the link to the Content Builder of your platform.

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