You can tame it on primitive plus but you need to make the kibble in a cooking pot. It won't work if you make it in a cauldron. Hopefully that's helpful to those that are trying to make kibble but cannot.
If you're on mobile and plan to tame a high level i recommend having a 10x soothing blam on you for a quick tame (obtained by watching ads (pretty rare) buying it with amber or doing some tributes with easy to get artifacts)
I found one on a nice ark day AND THEN I SAW THAT IT WAS A MUTE AND IT WAS NEXT TO A UNICORN so i used a bola shoved fish down its throat then BOOM I got a rare seagull AND I TAMED THE UNICORN it was da best day