I have a field in SFDC that isn't syncing to MKTO. I have a 1-1 sync and I turned on the "Marketo-Salesforce Sync"
Any thoughts why this isn't working
In regards to your response to Chris; you will want to check the user that is used for the actual setup in step #3 here: Step 3 of 3: Connect Marketo and Salesforce (Enterprise/Unlimited) - Marketo Docs - Product Document...
I would also make sure the field is available to that user as Chris mentioned. Here's some documentation around that: Step 2 of 3: Create a Salesforce User for Marketo (Enterprise/Unlimited) - Marketo Docs - Product Do...