Thanks for reaching out! We know how helpful the duplicate post feature was, and we understand how its absence might disrupt your workflow.
The good news is that this feature has only been temporarily paused while the team works on improving the overall performance and reliability of the scheduler. It’s actively being worked on and is expected to return in a future update.
In the meantime, you can still manually recreate posts by copying and pasting your content — not quite the same, but it can help you keep your social schedule moving.
We appreciate your patience and enthusiasm for Adobe Express, and we’ll make sure to keep you posted when the feature is back! Let us know if there’s anything else we can do to support you.
If you are talking about the ability to duplicate a post within the Scheduler, unfortunately that feature didn't make it into the new Adobe Express. The Uservoice has a topic for the feature to be returned, it does say it is planned but adding your support is always welcome:
Hello @Healthier31173772z5lm, you can duplicate your current design by clicking the "View All Pages" button in the secondary bar at top right (under the "Download" button, the one with the "1" in a square button) and there you can duplicate, create a new page etc. Happy designing!