I'm sorry to hear you have problems with connecting to WorkMail via SMTP. For the connection end-points and settings you can visit this documentation page: https://docs.aws.amazon.com/workmail/latest/userguide/using_IMAP_client.html
The url you need to use for SMTP is smtp.mail.us-east-1.awsapps.com on port 465. Also important to note that WorkMail SMTP does not support STARTTLS so you need to connect with ssl.
Connecting to the outlook endpoint will not work as this is not an smtp server and for the SES smtp endpoint, it will not work with WorkMail credentials.
Thanks for the cogent response. That solved it straight away. Thanks!
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