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If you want to use Interstitials you will have to create a matching Ad Type. To match the "creativeSizeType" Interstitial in Google Ad Manager do the following:

Pick the value "Out-of-page" for your slot size.

ADvendio Knowledge Base > 3.1.5.2.1 Interstitials (Google Ad Manager) > Screen Shot 2016-11-24 at 13.56.12.png

If the picklist value "Out-of-page" is not available in your Org, please request your administrator to create it and assign it to the ADMANAGER record type, making sure to follow the correct spelling:"Out-of-page".