Thanks for the question, @laurensimonelli. Yes, when you see
"reasons_not_targetable": [
"PROCESSING",
"TOO_SMALL"
]
it does indicate that the audience is still being processed. It is possible for the audience to become usable once it’s finished processing, as long as it’s large enough.
"reasons_not_targetable": [TOO_SMALL] means it’s finished processing, but not usable.
The reason we sometimes show both is that the API, unlike the UI, allows modifying (e.g., using the POST accounts/:account_id/tailored_audience_changes endpoint) audiences.
Hope this clarifies things.