The DSA upgrade has a calendar
Google's Ads Developer Blog set the schedule: in-account banners from September 2026, a reminder on 15 January 2027, and automatic migration of Dynamic Search Ads to AI Max between 1 and 28 February 2027. From then on, new DSA ad groups cannot be created.
Sources: Google Ads Developer Blog, 2026-08-12 (section 4, Dynamic Search Ads) · Set up AI Max for Search campaigns