My team recently started testing 'Import Audience' feature under Customer > Audience.
We successfully imported hashed email list of specific group. However, when we activate this audience into advertising destinations like Meta or DV360, it does not generate any audience size.
I understand Google might be tricky, but wouldn't Meta work perfectly with activating hashed email addresses? During the 'Mapping' stage in data activation process, I've selected hashed email customized attribute from our CRM data source. Do we need to build a separate data source/schema for import audiences?