Yes, we have the same problem. After upgrading vCenter 7.0.1 to 7.0.2 we can not read or write the tags. All other information like name, network, notes we can read.
Different PowerShell versions on Windows 10, Windows Server and linux clients tried. All have the same issue:
PS V:\> (Get-TagAssignment -Entity $vm -Category "Administator").Tag
Get-TagAssignment : 21.04.2021 15:09:09 Get-TagAssignment Der Wert darf nicht NULL sein.
Parametername: collection
In Zeile:1 Zeichen:2
+ (Get-TagAssignment -Entity $vm -Category "Administator").Tag
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Get-TagAssignment], VimException
+ FullyQualifiedErrorId : Core_BaseCmdlet_UnknownError,VMware.VimAutomation.ViCore.Cmdlets.Commands.Tagging.GetTag
Assignment
PS V:\> Get-TagAssignment -Entity $vm
Get-TagAssignment : 21.04.2021 15:10:17 Get-TagAssignment com.vmware.vapi.std.errors.operation_not_found {'messages':
[com.vmware.vapi.std.localizable_message {'id': vapi.method.input.invalid.interface, 'default_message': Cannot find
service 'com.vmware.cis.data.svc.resource_model'., 'args': [com.vmware.cis.data.svc.resource_model], 'params': ,
'localized':}], 'data': , 'error_type': OPERATION_NOT_FOUND}
In Zeile:1 Zeichen:1
+ Get-TagAssignment -Entity $vm
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Get-TagAssignment], CisException
+ FullyQualifiedErrorId : VMware.VimAutomation.ViCore.Impl.V1.Service.Tagging.Cis.TaggingServiceCisImpl.GetTagAssi
gnment.Error,VMware.VimAutomation.ViCore.Cmdlets.Commands.Tagging.GetTagAssignment