Running 11.2 on an i9 MAC. Softraid 6.0.1 b48 will not mount the raid array.
Did you "Allow" OWC as an identified developer in System Preferences/Security when prompted?
I have set "Allow apps downloaded from:" to "Anywhere" (added the anywhere option thru Terminal)
I take it from your reply you did not get, or missed the key dialog box here.
Try this:
Open System Preferences/Security. Unlock the pane.
Launch SoftRAID
Click on your startup volume tile.
"reinstall SoftRAID driver" from volumes menu.
DO not restart yet, when you are asked.
Switch over to System Preferences.
Do you see the option to "Allow" OWC as an identified developer now?
If so, Allow and you will be OK, then restart.
If not, attach a SoftRAID tech support file. Its possible you have obsolete extensions that are blocking other extensions from loading.