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If you like to use Interstitials you will have to create a matching Ad Type. To match the Google Ad Manager "creativeSizeType" Interstitial 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 you do not have this picklist value in your Org please have your administrator create it and assign it to the record type ADMANAGER - but make sure to follow the correct spelling "Out-of-page".