We've recently started using gated content forms for our Dutch market (we're US-based). This week, we noticed that the landing page forms were creating a large amount of duplicates leads when contact records already existed for those email addresses in SFDC. Looking a bit further, we noticed that these existing contact records weren't accessible via marketo's lead database. Similarly, the SFDC Sales Insight plugin on these contacts are locked in a way that doesn't allow you to view the contact in marketo, send them a marketo email from SFDC, etc.
Does anyone have an idea as to why these Dutch contacts may not be accessible to Marketo with our current set up? The landing pages are built in Marketo the same as our US pages. Our SFDC admin says that to his knowledge, the Dutch leads aren't handled any differently in our system (although he could be mistaken since this integration was set up so long ago).
Any insight as to how we may be able to get these contacts synced over to Marketo to avoid further duplicates would be appreciated.