The FDA's announced system migration to NextGen is scheduled for April 12 (12:00 AM ET) – April 14, 2025 (9:00 AM ET). No submissions are supported during this period. The FDA has confirmed that AS2 will be supported post-ESG NextGen go-live. Current file naming conventions and digital certificates will remain unchanged for AS2 submissions.
Propel currently uses AS2 for MedWatch submissions.