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Can't see it in disk management to be able to format, just device manager where it shows a resource error and thunderbolt control center.
All disk management shows is the nvme and a couple of tiny partitions of it : /
Toying with disabling the 3090 to confirm issue but need to get video out of the motherboard to the monitor first. I've got DP/HDMI ports on it but none seem to want to register out of the box so obviously something I need to set somewhere (thinking bios but have too much work today/tomorrow to look).
Have you tried formatting the raid in Windows ? I had an issue about a year or so ago where drives formatted exfat on mac weren't working in Windows but if done the other way round worked fine.