salesforce field hidden in web form is preventing campaign association

[Anonymous]

So I am new to Marketo, but a seasoned Salesforce Administrator. Our marketing team created some Marketo Web Forms to capture leads, and eventually migrate them in to SFDC. I have asked them to include a hidden field in the webform to help out my lead assignment rules, but during testing we discovered that the leads would come through to Salesforce, but not tied to a campaign (By campaign membership)

If we remove the hidden field, everything works perfectly, besides the assignment to a Sales Rep. Our Marketing team doesn't know of any workarounds, so hopefully there is someone on here knowledgeable about this limitation.

Thanks!!

[Anonymous]

Standard Salesforce setup is to use the "Campaign Membership" joining object - this allows leads to be tied to multiple campaigns.

The field I am asking to be passed is a picklist "Team Assigned" - since we have multiple sales teams (Product specialists), and most are territory driven, there has to be a unique identifier for us to have automatica assignments.

[Grant_Booth]

What is it that's supposed to be tying people to the SFDC campaign? And what's the relationship between the custom field and your autoassignment rules?