Not an apex domain
The domain a3-222-0-0.byoip-smtp-out.beta.us-east-1.ses.aws.a2z.com is not the root of its zone.
Instead, try zone transfer on beta.us-east-1.ses.aws.a2z.com .
Instead, try zone transfer on beta.us-east-1.ses.aws.a2z.com .