Email address verification with AWS Organizations
After you create an organization and before you can invite accounts to join, you must verify that you own the email address provided for the management account in the organization.
When you create an organization, if the management account has not been previously verified, AWS automatically sends a verification email to the specified email address. There might be a delay before you receive the verification email.
Verify your email address
Within 24 hours, follow the instructions in the email to verify your email address. If more than 24 hours have passed, see Resending the verification email.