Admob interstitial does not display

Hi everyone, I just created my first application on your platform. everything is nick.
the Admob Banner is displayed perfectly, but the problem is in the Admob interstitial, it loads correctly but does not display after clicking on the button mentioned in the block (see photo)

the ad does not show after clicking on the button. After several tests, I noticed that it is displayed if i click on the back button on my phone.

where is the problem please?

Your Block Setup Is Incorrect
Follow Step Like this For Show Interstitial Ads

blocks (18)

blocks (19)

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