Update: My unlocked Note 10+ is now in Sprint's system, and the required SIM card is SIMOLW516TQ.
I haven't been able to activate my unlocked Note 10+. I have chatted with Megan on Sprint's online chat, then Megan transferred me to a Sprint Care Specialist, and, in the end, the Sprint Care Specialist told me to go to a Sprint store. I did as I was instructed, and I went to a Sprint store. None of the Sprint store reps could get my unlocked Note 10+ activated. A Sprint store rep even called into corporate Sprint. Corporate Sprint told the Sprint store employee that I have to contact Samsung. I am not alone. There are others on community.sprint.com who are having the same activation issues.