OSX RAID volume no permission to view contents

I have a two disk RAID set up in an OWC Thunderbolt 4 bay drive. The other two disks (not in a RAID, are accessible. The RIAD volume gives me the classic The folder cannot be opened because you don't have permission to view its contents.

I tried the other admin user on the machine, no luck.

diskutil list RAID reports

Name: OWC-4-Bay-RAID-Mirrod-4TB

Unique ID: 1CC1F658-323D-4FD7-A3AE-0F61D2DB3E80

Type: Mirror

Status: Online

Size: 4.0 TB (4000443006976 Bytes)

Rebuild: automatic

Device Node: disk4

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# DevNode UUID Status Size

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0 disk2s2 705F4D94-CB70-4BBD-939C-42A01A8F9F30 Online 4000443006976

1 disk3s2 7D5270D4-DD38-4AC5-B0E3-3E5803A61736 Online 4000443006976

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running diskutil on the RAID volume reports:

diskutil info /dev/disk4

Device Identifier: disk4

Device Node: /dev/disk4

Part of Whole: disk4

Device / Media Name: OWC-4-Bay-RAID-Mirrod-4TB

Volume Name: OWC-4-Bay-RAID-Mirrored-4TB

Escaped with Unicode: OWC-4-Bay-RAID-Mirrored-4TB

Mounted: Yes

Mount Point: /Volumes/OWC-4-Bay-RAID-Mirrored-4TB

Escaped with Unicode: /Volumes/OWC-4-Bay-RAID-Mirrored-4TB

File System Personality: Journaled HFS+

Type (Bundle): hfs

Name (User Visible): Mac OS Extended (Journaled)

Journal: Journal size 311296 KB at offset 0x3a3c000

Owners: Disabled

Content (IOContent): Apple_HFS

OS Can Be Installed: Yes

Media Type: Generic

Protocol: SATA

SMART Status: Not Supported

Volume UUID: 9EA605A0-680F-3139-AB27-1243EE58D239

Total Size: 4.0 TB (4000443006976 Bytes) (exactly 7813365248 512-Byte-Units)

Volume Free Space: 2.0 TB (2032776216576 Bytes) (exactly 3970266048 512-Byte-Units)

Device Block Size: 512 Bytes

Read-Only Media: No

Read-Only Volume: No

Ejectable: Yes

Whole: Yes

Internal: No

Solid State: No

OS 9 Drivers: No

Low Level Format: Not supported

This disk is a RAID Set. RAID Set Information:

Set Name: OWC-4-Bay-RAID-Mirrod-4TB

RAID Set UUID: 1CC1F658-323D-4FD7-A3AE-0F61D2DB3E80

Level Type: Mirror

Status: Online

Chunk Count: 61041916

I am reluctant to venture any further (with DiskWarrior for example) until I figure out if I can repair this somehow. I am pretty much at the limit of my knowledge here. I cannot think of an event which might have provoked this problem.