I have a Dell R630 with Intel(R) Xeon(R) CPU E5-2690 v4 .

I have Proxmox installed and I have installed 4 ESXi hosts. Now, when I create a cluster I have an error vCLS can't start - No host compatible and it mentions MWAIT is set to 0 but expected to be 1.

Is there a flag I can use in Proxmox to pass it to the ESXi?

It is enabled in the Dell BIOS. I have been trying to fix this for the past week and I just can't figure it out