Wife and I both got this SM reply today:

I would like to apologize for the confusion. The account did not get linked on the 31st as we had expected. There was another system issue that prevented this. We are working with American Airlines to get these miles posted as quickly as possible. We hope to get the miles posted by the time your April statement prints.

We appreciate your inquiry and regret any inconvenience you may have experienced.

Please let us know if we can be of further assistance.