I don't enable the playoff roster part of the game so don't have any experience. Does OOTP not follow these rules?
https://www.mlb.com/glossary/transac...es-eligibility
According to the manual the rules OOTP22 uses are displayed on the playoff roster page (which I can't access since I don't activate that feature). Anyway I hope this help a bit and maybe someone who knows more will come along and post.