Creation of multiple AWS account in an org using single email id
Work Around
By default, for each AWS account, weneed one unique email ID. For example, if we are in need of 10 AWS accounts, we must have 10 email IDs.
We can avoid this by adding “+integer” to the end of your email to create numerous accounts that map to the same email address. For example, I have an AWS account mapped to my email,rahul@bighammer.ai . If I want to add one more account by mapping with the same email, rahul+1@bighammer.ai rahul+2@bighammer.ai and so on are possible email entries.
We will receive emails to the original email (without “+integer”).
Reference - https://www.cloudthat.com/resources/blog/how-to-create-multiple-aws-accounts-using-the-same-email-id