'Admob IOS crashing when loading AD

I am facing a strange issue. I've created an app with unity which is using Admon and was able to publish it on the appstore. Now I've prepared an update and when I try to run this app in xcode it crashes when loading an ad. When I use the test string from admob its working?! I havn't changed anything related to ads. On Android everything is working fine.

Anyone having an Idea?

Thanks



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