@jjairpants Well done on getting it v4 installed and booting at last, presumably on the problematic system in the following thread (hopefully):
Care to update that thread on how you eventually got around what-ever the problem turned out to be. Always nice to hear how a problem was sorted as then future folks, or future ‘us’, can find such things here and make the forum a better reference as we go.
Have these drives been used previously in an mdraid, or as a zfs pool? That can block them from being used as they are ‘otherwise engaged’ might be worth a try. We have yet to document these corner cases but there is a note on the mdraid prior use here:
If so that issue documents how one releases such prior use mdraid devices from their prior lives (and wipes them without return mind).
Hope that helps. And as always let us know how you get along. Always useful to have feedback on such things as our docs for example, and they are intended to get folks of any knowledge up and running as easily as possible. So problems are opportunities in such case.