Admob iOS Rewarded Videos don't close

Dear friends - devs,

I am currently working on a project where I offer watching a video advertisement for in game cash reward. I am using Admob SDK, my platform is iOS. I successfully manged to initialize my video ad, request it and show. However I never see it closing after I watched it fully. Respectively I don't see "on rewarded" event which is the most important in my case. Instead if I close the ad after watching it fully (and this is the only option I have since the ad keeps hanging opened), I receive "on close" event.

Is there something I am missing?

Btw, going through full integration tutorial from a chinese girl (https://www.youtube.com/watch?v=YHHj1bZUbsc) didn't make me see the "on rewarded" event either.

Maybe there is something wrong in the ad settings in Admob console? I believe there is everything good, since I set the ad as a "video reward ad" and it has no limitations and a little description. And I didn't specify any mediators.

I hope someone can help me. Thanks!