My AWS Workmail Email is bouncing external emails

Hi so we are using AWS Workmail for our organization's emails.

Strangely, a user from UK complained that his email to my email address on AWS Workmail was bouncing, and gave the following error:

"Each of the following recipients was rejected by a remote mail server. The reasons given by the server are included to help you determine why each recipient was rejected.

Recipient: user@domain.com Reason: 5.7.1 TLS 1.2+ required by recipient"

How do I get around this TLS requirement for users emailing me? Thanks,

Best Regards!