So found out some more info on this. Probably related to the fact I have tested successfully a StoreKit Rendered ad with the same advertised app id. When I call endImpression for the first time I get the following logs from the appstore: error 09:23:02.243885+0300 appstored Existing impression with higher fidelity found. Not adding params error 09:23:02.244108+0300 appstored Failed to finalize impression for app bundle ID:xxx.xxx.xxx, adam ID:0 And when I try to call startImpression with a new ad I get the "Cannot start an impression since an open impression already exists" Seems like an Apple bug.