Hi All,
I just have a very simple question, what is an AIL value in marketo ?
I don't think that's a standard field. You can see the list of standard fields here: https://developers.marketo.com/rest-api/lead-database/fields/list-of-standard-fields/
Probably a custom field that is syncing over via your CRM or someone before you created it in Marketo.
I would ask whoever runs your CRM. Often you'll find outdated or graveyard fields exist within Marketo and CRMs.