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1. Ensure that iframe user sync is enabled within your Prebid configuration, the example below:
pbjs.setConfig({
    userSync: {
        filterSettings: {
            iframe: {
                bidders: ['consumable'],
                filter: 'include'
            }
        }
    }
});
2. If the above is not possible, you can place the following code in the <head> of your site:
<scripttype="text/javascript"src="https://sync.serverbid.com/ss/2000462.js"></script>