AzureAuth.ps1

[CmdletBinding(DefaultParameterSetName = 'Credential')]
param (
    [Parameter(ParameterSetName = 'Credential')]
    [System.Management.Automation.PSCredential] $Credential,

    [Parameter(ParameterSetName = 'ClearText')]
    [string] $ApplicationId,

    [Parameter(ParameterSetName = 'ClearText')]
    [string] $Password,

    [Parameter(ParameterSetName = 'Credential')]
    [Parameter(ParameterSetName = 'ClearText')]
    [string] $TenantId
)

try {

#region Azure Authentication
    # If credential object is supplied we are set to go
    if ($PSCmdlet.MyInvocation.BoundParameters['Credential']) {
        Write-Verbose 'Using supplied credentials to authenticate.'
    }
    # If ApplicationID and Password are supplied, use these to create a credential object
    elseif ($ApplicationId -and $Password) {
        Write-Verbose 'Using supplied ApplicationID and Password to authenticate'
        $Credential = New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList ($ApplicationId, (ConvertTo-SecureString $Password -AsPlainText -Force))
    }
    # Else use interactive login
    else {
        Write-Verbose 'Using interactive login to authenticate.'
        $Credential = $null
    }

    # Run Azure Login
    if ($Credential) {
        # Ask for Tenant ID if not supplied
        if (-not ($TenantId)) {
            $TenantId = Read-Host -Prompt 'Please enter Azure Tenant ID'
        }
        Login-AzureRmAccount -ServicePrincipal -Credential $Credential -TenantId $TenantId -ErrorAction Stop
    }
    else {
        Login-AzureRmAccount -ErrorAction Stop
    }
#endregion

    # YOUR CODE GOES HERE

}
catch {
    Write-Warning $_.Exception.Message
}