Hey,
Did you format your drives as NTFS/ReFS? You need to format drives to see them as an available storage in Failover Cluster. The following article should help with configuration:
https://www.starwindsoftware.com/resource-library/starwind-virtual-san-for-hyper-v-2-node-hyperconverged-scenario-with-windows-server-2016/
Cheers,
Alex Bykvoskyi
StarWind Software
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