I just unlocked "Solar - Tier 3" today. What are the tiers and is there any additional information on what ARP level unlocks them?

Any YouTubers on here? I would like to Play XDefiant sometime with some of you maybe, or Borderlands 1-3 Series!

Twitch isn't awarding ARP Points for viewing, anyone have a solution? Yes, my accounts are linked.

How is everyone doing? Does anyone else make YouTube Videos and maybe wanna work together? I have 12,600 subscribers, looking to work with people around the same area!