Ok, as long as I am under level 40, I cannot EVER get (a) partner(s) in Strikes! I had to do the ENTIRE Shield Brothers Strike solo and I was level 39! Why is it that the more powerful you are, the more teammates you "need?"
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From my experience matchmaking tries to match you with people around your level. So if there aren't many other 39's looking for strikes you might not have a buddy