looks like it is one of the known issue if i am not wrong as per the vCAC release Note 5.2
issue ID 56134
[Provisioning/vSphere] When vSphere access is se
t to cluster level and not global level, the
exception: "System.NullReferenceE
xception: Object re
ference not set to an instance of an
object" appears. To work around this issue, you must set vSphere access to global and Data-
center is a required permission
But not sure if this is relevant to my issue and if it is then how to set vsphere access to Global? can any one help me
Br,
MG