MIM PAM - Get-PAMRoleForRequest PowerShell - The caller was not authenticated by the service

So I am following this manua https://docs.microsoft.com/en-us/microsoft-identity-manager/pam/step-7-elevate-user-access

 Import-module MIMPAM
 $r = Get-PAMRoleForRequest | ? { $_.DisplayName –eq "CorpAdmins" }
 New-PAMRequest –role $r
 klist purge

The powershell above gives me this kind of error:

Get-PAMRoleForRequest : The caller was not authenticated by the service.
At line:1 char:6+ $r = Get-PAMRoleForRequest | ? { $_.DisplayName -eq "CorpAdmins" }+      ~~~~~~~~~~~~~~~~~~~~~+ CategoryInfo          : NotSpecified: (:) [Get-PAMRoleForRequest], Secur
   ityNegotiationException+ FullyQualifiedErrorId : GeneralServerError,Microsoft.IdentityManagement.
   RequestorPamCmdlets.Commands.GetPamRolesCommand