GetToken.ps1

Function GetToken {
    Try {
        Write-Verbose "START: Function GetToken";

        $azProfile = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile;
        if(-not $azProfile.Accounts.Count) {
            Write-Error "Ensure you have logged in before calling this Function.";
            Exit;
        }

        $currentAzureContext = Get-AzContext;
        $profileClient = New-Object Microsoft.Azure.Commands.ResourceManager.Common.RMProfileClient($azProfile);
        Write-Debug ("Getting access token for tenant: " + $($currentAzureContext.Tenant.TenantId));
        $token = $profileClient.AcquireAccessToken($currentAzureContext.Tenant.TenantId);

        Write-Verbose "DONE: Function GetToken";
        Return $token.AccessToken;
    } Catch {
        Write-Verbose "ERROR: Function GetToken";
        Throw $PSItem;
    }
}

Found error in line #5, should be:
$azProfile = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile;