Seems Seagate X14 12TB (ST12000NM0038) drives with a LSI00344 9300-8i HBA controller on UNraid v 6.8.3 also does not work, unless I am doing something wrong. I have 11 active and 2 unmounted and is seems they just like spinning lol.
I am guessing this is why UNraid does not support this feature natively. As it seems SAS drives do not have it standardized. That's a shame really.