The 20 free time crystals button doesn't do anything

I haven’t been able to watch ads for free time crystals for a week. The watch button is there but whenever i press it, no ads are shown. How can I fix it? I have an iPad mini and iOS 9.3.5
Edit: I have tried turning my cell phone off and on, but it doesn’t work.
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4 posts were merged into an existing topic: I cant watch ads for TC to get TC, why?