There are 3 distinct account areas an Email Address is utilized. Each must be considered and updated separately as needed.
User Email Address
The User email address is the one used to login to the AMP Portal.
From within the AMP Portal:
Click on your Profile icon at the top right corner of the AMP Dashboard
Click Change next to your email address
Change the email address and click Update User
Idea Generator
From within the AMP Portal:
On your dashboard, scroll down to the "Your Brand" section
Click Edit Brand to update company information
AMP Billing Email Address
From within the AMP Portal:
Click on your Profile icon at the top right corner of the AMP Dashboard
Click "Billing & Subscription"
Click "change" on "your billing email address is"