Trouble passing MCVISID to a marketing Vendor.

[Dcampanella]

Hello All,

We are having an issue with a vendor tag Neustar. They are requesting we pass Adobe MCVISID (Marketing Cloud Visitor ID) in as query string parameter to Neustar.  We are using tealium, to grab the ID, which seems to work fine, but as soon as we send the nuestar tag our visits and bounce rate increases. We are using the following, has anyone encountered something like this? or is there a better practice for passing the ID to a vendor?

var visitor = Visitor.getInstance("561431695D6D02FA0A495F8F@AdobeOrg");
 var mcvid = visitor.getMarketingCloudVisitorID();
 b.MCVISID = mcvid;