Thank you for using WorkMail. The error message you received is to complete your domain set-up. After adding a domain in WorkMail you need to add domain records to prove you own the domain and configure mail routing for that domain. It also includes domain records to make mail delivery more secure.
More details on what each record is for can be found here: https://docs.aws.amazon.com/workmail/latest/adminguide/add_domain.html
Kind regards, Robin
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