Twitch prime not possible with iTunes?

I subscribed to prime video via iTunes (i.e. On my iphone) and would like to activate twitch prime.

But I don't have any prime advantages (except for video) and when I log on to the amazon website with this account, no "Prime Membership" is displayed, but only the subscription via a third party provider (Itunes) under "My Membership & Subscriptions". This can't be edited.

My subscription costs 6.99 Amazon prime regularly 7.99.

Maybe I only subscribed to prime video & there are different subscriptions?

Can I even activate twitch prime this way?

Find nothing on the Internet and need your help!

Looks like you only have a Prime Video and no Amazon Prime subscription. I think you can only activate Twitch Prime with an Amazon Prime subscription.