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Hi There
You have to login to the account as the root user to change the email address first before updating it in the Provisioned Product. Please follow these steps for updating the account email address:
https://docs.aws.amazon.com/controltower/latest/userguide/change-account-email.html
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Matt-B, your recommendation was already done. This was working before it stopped working. We have vended many accounts prior to this stopping to work.