I setup 3 apps this week to be host and all are failing with
We have been attempting to verify the DKIM setup of mydomain.com for the last 3 days. We have not been able to detect the required DNS records in your DNS settings. If you still wish to use DKIM when sending through Amazon SES or Amazon Pinpoint, please confirm that the DNS records are present and retry the set-up process via the Amazon SES or Amazon Pinpoint console or the API.
I setup up around 6 in the last few months and never had this issue.