Can not execute Powershell Script in .Net MVC Application

Question

I have a .Net MVC application which need to check and get some information from another server via powershell command with code shown below. But app can not get information

try
{
string un = @"domainA\domainUserName";
System.Security.SecureString pw = new System.Security.SecureString();
string password = "";

string exchangeServerName = "ServerAdress/powershell";
foreach (char ch in password)
{
    pw.AppendChar(ch);
}

using (PowerShell _powerShell = PowerShell.Create())
{

    var credential = new PSCredential(un, pw);
    _powerShell.Runspace.SessionStateProxy.SetVariable("Credential", credential);
    _powerShell.AddScript($"$Session = New-PSSession –ConfigurationName Microsoft.Exchange -ConnectionUri {exchangeServerName} -Credential $Credential -Authentication Kerberos -AllowRedirection");
    _powerShell.AddScript("Import-PSSession $Session");
    _powerShell.Invoke();
    _powerShell.AddScript(@"get-mailbox -identity " + mail + " | Select-Object ProhibitSendReceiveQuota");
    var results = _powerShell.Invoke();

    string size = "";
    string used = "";
    string size2 = "";
    foreach (PSObject obj in results)
    {
        size = (obj.Properties["ProhibitSendReceiveQuota"].Value.ToString());
    }

    _powerShell.AddScript(@"Get-MailboxStatistics -Identity " + mail + " | Select-Object Totalitemsize,DatabaseProhibitSendQuota");
    var results2 = _powerShell.Invoke();

    _powerShell.AddScript("Remove-PSSession $Session");
    _powerShell.Invoke();

    // 
    
}
}

Target server and source server are in different domains. In local running app wroks perfectly. What can be cause this issue and how can I resolve issue.

Thank you.