Powershell command not found after PSSession Import - powershell

Question

I'm trying to add external contact to MS Exchange with Powershell.
$username = "username#domain.com"
$password = "password"
$secure_password = $password | ConvertTo-SecureString -AsPlainText -Force
$credencial = New-Object System.Management.Automation.PSCredential ($username, $secure_password)
$session_name = "office365_session"
foreach($tmp in Get-PSSession){
if ($tmp.Name -eq $session_name) {
$opened_session = Get-PSSession -Name $session_name
}
}
if ($opened_session -eq $null) {
$opened_session = New-PSSession -Name $session_name -ConfigurationName Microsoft.Exchange -ConnectionUri "https://ps.outlook.com/powershell/" -Credential $credencial -Authentication Basic -AllowRedirection -WarningAction SilentlyContinue -ErrorAction Stop
Import-PSSession $opened_session -AllowClobber -WarningAction SilentlyContinue -ErrorAction Stop -DisableNameChecking | Out-Null
}
New-MailContact -Name "test" -DisplayName "test user" -ExternalEmailAddress "some.email#mail.com" -FirstName "Test" -LastName "User"
But "New-MailContact" command is not found and throws an error:
New-MailContact : The term 'New-MailContact' 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.
How to run that "New-MailContact" command? Maybe I need import something else or maybe there is another way to add contact?

Answer 1

You missed out the crucial part which is creating a session to the Exchange box therefore your import doesn't work.
Here is an example for O365
$session = New-PSSession -ConfigurationName Microsoft.Exchange -ConnectionUri https://ps.outlook.com/powershell -Credential $credencial -Authentication Basic –AllowRedirection;
only then you can run
Import-PSSession $session -AllowClobber -WarningAction SilentlyContinue -ErrorAction Stop -DisableNameChecking | Out-Null
New-MailContact -Name "test" -DisplayName "test user" -ExternalEmailAddress "some.email#mail.com" -FirstName "Test" -LastName "User"