WFC with Server 2016 isn't going to work on 5.5 as it's not supported. Yet another reason you need to upgrade.
Really? The "Setup for Failover Clustering and Microsoft Cluster Service" guide says "Win 2012r2 and above". And I know Win 2016 itself (non-clustered) works on ESXi 5.5U3b; I'm running it ...
Yes, I would much prefer to run this on our ESXi 6.7 U1 cluster. However, that is not what I was assigned. And yes, I mentioned no support, and how it's a lot easier on 6.7, etc. There are reasons we need it on ESXi 6.7, however, and so I am trying to set it up. (and unfortunately the application we want to run requires SQL 2016, I am told, so I may be stuck).
Win 2016 clustering works, as I noted in my original message. It is just coming up as invalid disk, on a non-clustered disk.
I will tell my boss this is a non-supported environment. Then again, running on 5.5 is also non-supported, so I may have to attempt it regardless. I will see if changing the disk format of the non-clustered disk makes it work.