Adobe Marketo Engage September 2026 release sets new interface for general availability

Adobe published release notes for the September 2026 Marketo Engage release, with standard release cycle features starting on September 25, 2026. The release schedules general availability of the refreshed interface that began a phased rollout in August, and lists three other features covering imports, flow step timeouts and Email Designer tables. The announcements cover new naming rules for custom activity attributes, static list limits for lead activity calls, the completed access_token deprecation and the upcoming removal of Grab Images from Web.

The details

• The refreshed interface is set for general availability by mid-October 2026.
• A Classic UI option remains available through the January 2027 release.
• Select Partition on Import lets users choose a partition from the local workspace when importing people.
• The Self-Service Flow Steps callback timeout increases from one hour to four hours.
• API names for custom activity attributes may only contain letters, numbers and underscores.

Context

The new interface began a phased rollout in the August 2026 release, which also made the MCP server generally available. The November 2026 release that followed, covered here on October 21, 2026, lists Callable Agents and confirms the Grab Images from Web deprecation announced in this release. Our coverage of Marketo Engage since October 2025 also includes Dynamic Chat changes in March 2026.

Not disclosed

• Whether any workflows change for users moving from the Classic UI
• Release timing for the Email Designer table feature
• Replacement options for Grab Images from Web