I have a Followers campaign for which I’m trying to get impressions, follows etc. as shown in the Derived Metrics docs, i.e. getting
promoted_account_follows, but I get the error that these are not valid metrics, when the docs clearly state that these should be used for a Followers campaign.
Instead, I don’t get an error if I get impressions as
promoted_tweet_timeline_impressions, by requesting these fields instead.
So is the documentation wrong or is there a bug?