I have not been able to mount the Pegasus R2 M4 on my new Mac Mini with the M1 SOC. I am able to run Promise Utility but it does not recognize the drive's presence at all.
In Finder, Drive Utility, Storgage tab on "About This Mac," the R2 is not visible at all
In the detailed system report, the R2 appears in the Thunderbolt portion. I have attached a screenshot of that report.