I think AS normally only get back to people that are successful in moving to the next stage of the process. After a while they send out the automated PFO’s to everyone else.
For example, I applied to the AstraZeneca and Covington AS Mentoring Scheme. A lot of people on this forum hadn’t heard back at all but they’d progressed me and others to the VI stage.
If their email said they’d get back to people by the 7th of March, I imagine they’ve already emailed the people moving forward. Perhaps you could send them an email to confirm?