Field not showing up as option on Form

[Anonymous]

I am trying to add a hidden field on a form that will capture some cookie information. The field is mapped from SFDc to Marketo. In Marketo, I can filter on the field in smart lists. When I try to add the field on my form, it's not listed as an available field to select.

Any ideas why it's not there?

[Kristen_Malkov1]

Yep! John is right.

[Anonymous]

This is the field:

and I have admin rights in Marketo.

I'm trying to add this field to a form to read a cookie and fill in the original referring URL. We have a similar field that documents referring URL, but that's in there and I was able to add it to the form with no problem.

[John_Clark1]

Hi Karim,

This field is system managed, so it's not possible to populate it using a form.  You would need to create a custom field in your instance to use for the purpose you describe.

John

[Kristen_Malkov1]

Can you give a little more background? What type of field is this? Is it managed by Salesforce? What is the Marketo profile permission for this field?

If I had to guess, the field type or permission has to do with why it's not showing up as 'available'.