Cannot format for RAID/JBOD & initialize disks, attempting makes disks invisible to OS

[kth5]

I'm working with iprutils built from tha tag rel-2-4-19.

PKGBUILD here:
https://github.com/kth5/archpower/tree/master/iprutils

I have 4 IBM branded 2T SAS disks in a S822L running Opal (stable Linux 6.11.9 on ArchPOWER) that I want to bring together in a RAID5. Originally the disks were 512byte block formatted so popped up in the OS just fine. After formatting they just disappear from the OS entirely and just make an occasional appearance in dmesg when scanning the scsi bus and iprconfig lists them as requiring a format:

This is weird, since the disks seem formatted for neither JBOD and RAID use anymore.

Related messages in dmesg:

Nov 20 22:37:02 : IBM Power RAID SCSI Device Driver version: 2.6.4 (March 14, 2017)
Nov 20 22:37:02 0001:08:00.0: Found IOA with IRQ: 0
Nov 20 22:37:02 0001:08:00.0: enabling device (0140 -> 0142)
Nov 20 22:37:02 0001:08:00.0: Received IRQ : 36
Nov 20 22:37:02 0001:08:00.0: Request for 16 MSI-Xs succeeded.
Nov 20 22:37:02 0001:08:00.0: Initializing IOA.
Nov 20 22:37:02 0001:08:00.0: Starting IOA initialization sequence.
Nov 20 22:37:02 0001:08:00.0: Adapter firmware version: 19512200
Nov 20 22:37:02 0001:08:00.0: IOA initialized.
Nov 21 12:17:10 october iprconfig[14513]: tool_init: fw_type attr = 1.

I am not sure how to proceed here and help would be very much appreciated. Access to the machine via SSH can be granted temporarily if it helps.