Hi, ​@Amesary!

I suppose you're following the instructions in this help article: https://help.manychat.com/hc/en-us/articles/14281372007196-Facebook-Ads-Trigger

That should work without issues. But if Manychat isn't displayed as partner app in your Ads Manager, it's probably a problem between Manychat and Meta's integration.

Check also if your channel connections were made via Meta Business Suite (instead of just Instagram/ Facebook account connection).

Refreshing permissions could also help: https://help.manychat.com/hc/en-us/articles/14281464342684-Refresh-permissions

If you have an older account… check also if the settings in your Facebook account are up to date: https://help.manychat.com/hc/en-us/articles/14281438557468-Can-t-connect-Facebook-to-Manychat

Hope this helps!