The option to select a level (Ad, Ad Set or Campaign) when connecting a Facebook Attribution source has been disabled.
After a customer reported that their attribution was being offset by one day, and after being in contact with Facebook we found that these breakdowns were not officially supported by the current version of the Facebook Attribution API. It's currently not clear if the reported bug is related to the breakdown level, but we are following Facebooks recommendation and disabling the option until it's officially supported.
Existing sources will keep their current breakdowns but if you experience any problems, we recommend reconnecting the source.
The Facebook Attribution API is in open beta and is subject to change. We're therefore extra eager to hear from you if you experience any problems or have feedback. Please reach out via the in-app chat or email us at firstname.lastname@example.org