Mobile Advert (Testing works only once)

I have Banner and Interstitial Adverts in my game.

The bottom Banner only shows when the full screen menu is opened.

Right now I create it not shown on game start, show it when the menu opens and hide it when the menu closes.

I test it by exporting it to iOS and it works once, but won't become visible the second time when I open the menu. I'm never leaving layout btw.

Similar with the Interstitial Advert. I use it like a "tip button" so you can watch an ad to support me.

Upon tapping the button the advert gets created (shown: true). This works when testing once and I see the test advert. But after closing the ad, nothing happens when pushing the button again.

Are those limitations of the test mode? I have no frequency capping in my Admob settings.

With the interstitial advert I don't need it to be not shown immediately. So show can be true.

Do you mean reloading as in triggering "create interstitial advert" again? Because this is the event triggered by the button tap in my setup. Maybe I'm not getting why this setup would work.

Isn't it the same?