I am unable to equip my title MMXXI even though I unlocked it and used it before witch queen. I have 28 of 30 completed as well. The reason I didn't have it equipped going into witch queen was that my final seal before WQ was a season of chosen so I was using that for a bit. I worked hard to unlock this seal before Witch Queen and hope that I can use it going forward.
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I am also not able to equip the title.