Since March 2023 Facebook Ads integration feature has been deprecated and is no longer supported.
To include additional ads or ad sets to live campaigns, open your Ads Dashboard. Click List Settings and turn a hierarchical view on.
- Hover over the campaign you want to add a new Ad Set to and click the menu button. Then click Create Ad Set.
- Fill out your audience, placements, and budgets. Then select Send to Facebook.
How to add new Ads to existing Ad Sets
In the Ad List, you can include new Ad Set elements by selecting Create Ad in the left navigational tray.
Once you fill out your design advert and message, select Send to Facebook for approval. That's it.
I hope this helps!