How to get new playlists Mix feature?

[Indegate]

Hi everyone, I just signed up for Spotify Premium yesterday because I heard about its playlist mixing feature and saw it being widely used by my friends. However, after signing up, I still can't use this feature. What should I do?

[Indegate]

I signed up for beta testing and tried deleting and reinstalling it but it still doesn't work. I really want to use it🥹