Cant run powershell upgrade commands

Hi,

I have a 3 node cluster that I have just upgraded to server 2016 using the rolling upgrade process. Everything went smoothly and I am now read to upgrade the functional level of the cluster.

However I am seeing strange errors that the required powershell commands are not recognised. See below.

PS C:\> Update-ClusterFunctionalLevel
Update-ClusterFunctionalLevel : The term 'Update-ClusterFunctionalLevel' is not recognized as the name of a cmdlet,
function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the
path is correct and try again.
At line:1 char:1
+ Update-ClusterFunctionalLevel
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Update-ClusterFunctionalLevel:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

PS C:\> Get-Cluster -Name FHMHVS00 | Update-ClusterFunctionalLevel
Get-Cluster : The term 'Get-Cluster' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ Get-Cluster -Name FHMHVS00 | Update-ClusterFunctionalLevel
+ ~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Get-Cluster:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

PS C:\> Get-Cluster | select ClusterFunctionalLevel
Get-Cluster : The term 'Get-Cluster' is not recognized as the name of a cmdlet, function, script file, or operable
program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
At line:1 char:1
+ Get-Cluster | select ClusterFunctionalLevel
+ ~~~~~~~~~~~
    + CategoryInfo          : ObjectNotFound: (Get-Cluster:String) [], CommandNotFoundException
    + FullyQualifiedErrorId : CommandNotFoundException

PS C:\> Get-ClusterResource
Get-ClusterResource : The term 'Get-ClusterResource' is not recognized as the name of a cmdlet, function, script file,
or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and
try again.
At line:1 char:1

I ran Get-Command and sure enough these commands are not listed.

Any ideas would be appreciated.

Thanks