NVME SSD in UGREEN Mac mini M4 Dock stopped mounting

Apologies if this is the wrong place to ask – but my SSD in the UGREEN Mac mini M4 Dock has stopped mounting. Disk Utility does not show anything. I tried the SSD in a separate enclosure and it works fine. The only change I suppose was the Mac OS upgrade to 26.4 few hours ago.

Does anyone have an idea why this could be the case? I have tried separate NVME SSDs and they all work with enclosures just not with the Dock.

Any help/guidance would be greatly appreciated. The Amazon return window closed on 19th March for this dock.

regards,

Shaun