Octopath Traveler above a million (physical)! Yay!
Now we have (third party):
The Elder Scrols V: Skyrim
Crash Bandicoot N. Sane Trilogy
If I have to guest the next, wiil be:
Diablo III: Eternal Collection
Just Dance 2019
Mario x Rabbids is a million seller as well. wouldnt rule out Super Bomberman R as a million seller either. It should be really close if not already over 1M.