I’m using API v3 and using /contact/sync to update/create a contact
AC strips out my values for utm and does not update the contact with them (but other default fields work).
This is what I submit:
Phone updates just fine, but utm_source and utm_campaign are never updated in AC.
For context, we use multiple landing page software and some of them don’t accurately submit data to AC, so we have our own little server running to fill in the gaps. ie so Webpage->Server->Update contact utm params.
Any ideas on what I am doing wrong here?