ClusterComputeResource configurationEx.vsanConfigInfo return None

[madsugar]

pyvmomi_version: 7.0 (vim.AboutInfo) { dynamicType = , dynamicProperty = (vmodl.DynamicProperty) [], name = 'VMware vCenter Server', fullName = 'VMware vCenter Server 6.5.0 build-15259038', vendor = 'VMware, Inc.', version = '6.5.0', build = '15259038', localeVersion = 'INTL', localeBuild = '000', osType = 'linux-x64', productLineId = 'vpx', apiType = 'VirtualCenter', apiVersion = '6.5', }

ClusterComputeResource configurationEx.vsanConfigInfo return None，but in the vc mob page I can find the vsanConfigInfo info.