Unable to prepare compute cluster in homelab

Hi all,

I'm installing NSX 6.3 in a nested ESXi 6.5/VCSA 6.5 environment. When I previously did this I had an issue preparing my compute cluster, documented here : https://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=2053782

Also covered in another blog post here : http://www.sneaku.com/2015/08/27/nsx-v-unable-to-install-vibs-blame-vum/

However, I performed the same tasks as I did on a previous version of my lab (going to https://vc/eam/mob/, selecting my agent, selecting update and supplying:

<config>

          <bypassVumEnabled>true</bypassVumEnabled>

</config>

I get "Method Invocation Result: void" after invoking this method, which implies that it's processed that update, however when I check the config again it states:

bypassVumEnabled boolean false

Has anyone come across this issue before?

Thanks