I have a multitenant Active Directory setup, and I connect to it remotely from a jumpbox server using PowerShell with the following script:

Relationship diagram

$cred = Get-Credential
$Session = New-PSSession -ComputerName XXXXXX -Credential $cred -Port XXXX
Enter-PSSession $Session

The jumpbox server has the Exchange Server Management tool (MS 0365) installed, and the Active Directories are synchronized with MS O365.

After connecting to PowerShell, I run the following commands to enable a mailbox:

Add-PSSnapin *recipientmanagementEnable-RemoteMailbox -Identity "SamAccountName" -RemoteRoutingAddress [email protected]

While the above commands work perfectly when run directly from PowerShell.
But unable to connect to PowerShell using C#. Need a equivalent code in C#.

Tried below code, need to fix this

// Create a PowerShell pipeline
 PowerShell ps = PowerShell.Create();
 ps.Runspace = runspace;
 // Create a PSSession
 ps.AddCommand("New-PSSession");
 //ps.AddParameter("ConfigurationName", "Microsoft.Exchange");
 ps.AddParameter("ComputerName", "XXXXXXXX");
 ps.AddParameter("Credential", new PSCredential("XXXXXX", ConvertPassword("XXXXXXX")));
 ps.AddParameter("Port", XXXX);
 
 var sessionResult = ps.Invoke();
 ps.Commands.Clear();
 // Add the Session
 ps.AddCommand("Import-PSSession")
 .AddParameter("Session", sessionResult[0]);
 ps.Invoke();
 // Add the *recipientmanagement snap-in
 ps.Commands.Clear();
 ps.AddCommand("Add-PSSnapin")
     .AddParameter("Name", "*recipientmanagement");
 ps.Invoke();
 ps.Invoke();

 // Enable Remote Mailbox
 ps.Commands.Clear();
 ps.AddCommand("Enable-RemoteMailbox");
 ps.AddParameter("Identity", "SamAccountName"); 
 ps.AddParameter("RemoteRoutingAddress", "[email protected]");  
 ps.Invoke();

Error:

at :// Add the Session
System.Management.Automation.CmdletInvocationException: 'Files cannot be loaded because running scripts is disabled on this system. Provide a valid certificate with which to sign the files.'

at : // Add the *recipientmanagement snap-in
System.Management.Automation.CommandNotFoundException: 'The term 'Add-PSSnapin' is not recognized as a name of a cmdlet, function, script file, or executable program.

at: // Enable Remote Mailbox
System.Management.Automation.CommandNotFoundException: 'The term 'Enable-RemoteMailbox' is not recognized as a name of a cmdlet, function, script file, or executable program.
Check the spelling of the name, or if a path was included, verify that the path is correct and try again.'