Did you find the root cause / solution to this.
I've encountered this error after deleting a test cluster and trying to redeploy.
In the deployment wizard on the azure portal, it only asks for the deployment / lcm user and this isn't a domain admin by default, and in my previous install it worked fine.
That's not to say I haven't done something else incorrectly, but I also hit this today with the latest HCI OS/deployment