The term 'New-MailContact' is not recognized

Hi SX,

You're correct in that under default conditions, New-MailContact should be available for members of the Recipient Management role, however, it would pay to check that holds true for your environment.

Here's a couple of commands you can use to validate which roles permit access to New-MailContact as well as  cross-check the RBAC memberships your test account currently holds.

Note the inline comment pertaining to leveraging the -CmdletParameters parameter, as Exchange Online filters beyond the base commandlet and into the actual parameter usage.

# Microsoft Learn reference:
# https://learn.microsoft.com/en-us/powershell/exchange/find-exchange-cmdlet-permissions?view=exchange-ps#use-powershell-to-find-the-permissions-required-to-run-a-cmdlet

# Use this command to verify which roles can run a given command. It may pay to also add in the -CmdletParameters to get a more granular response from Exchange Online.
Get-ManagementRole -Cmdlet "New-MailContact" | ForEach-Object {
    Get-ManagementRoleAssignment -Role $_.Name -Delegating $false | Select-Object -Property Role, RoleAssigneeType, RoleAssigneeName;
} | Format-Table -AutoSize;

# Use this command to enumerate the members of all roles, which you can use to cross-check the test account's current role-based access.
Get-RoleGroup | ForEach-Object {
    $Role = $_;
    Get-RoleGroupMember -Identity $_.Identity | ForEach-Object {
        [PSCustomObject] @{
            Role = $Role.Name;
            Type = $_.RecipientType;
            Member = $_.Identity;
        }
    }
}

Cheers,

Lain