Hello, I have an iOS Phone and when I entered Twitch and linked the account it told me that it is not available on iOS, seriously, aren't we apples entitled to those rewards? Has anyone from iOS gotten them?

This is a Twitch Policy thing, cf: https://help.twitch.tv/s/article/mission-based-drops?language=en_US#faq

You should be able to claim them outside of the app (e.g. browser on a Desktop PC; browser on iOS should theoretically work, too). Just not within the App.