Hi all.
We have exactly the same problem.
We can't install Aruba MM on Hyper-v running on Xeon Gold 6148 CPU.
It's Windows Server 2019 Standard.(supporting SSE4.2 )
We tried different MM versions: 8.4.0.0, 8.4.0.1, 8.3.0.6, 8.2.2.1 - all with 6 cores and 8192 Mb memory or 3 cores and 6144 Mb memory. All was done according to ArubaOS Virtual_Appliance_Installation_Guide.pdf, chapter Chapter 9 "Installing ArubaOS Using Windows Hyper-V "
We are still getting Error: Unsupported CPU (Intel CPU with ssse3 instruction set support required))
Transferred old 8.2 to another VM - it works now, but still no good guide how to install it to a new VM...