[2021] Seems the Shadowhunter fix may have been released, I have been stuck at 15/15 for days and just checked mine. Finally unlocked! For everyone that has been posting in this sub about it, take a look and let me know if yours is there too.

Maintenance for this concluded by 2:00 am/PT on April 10th, 2021. Glad to see that you're reporting success!