diff --git a/src/Provider/Azure.php b/src/Provider/Azure.php
index 2cd8fa8..78c8b08 100644
--- a/src/Provider/Azure.php
+++ b/src/Provider/Azure.php
@@ -28,11 +28,25 @@ class Azure extends AbstractProvider
      *
      * @var string
      */
-    protected $urlAuthorize = 'https://login.microsoftonline.com';
+    protected $urlAuthorize;
 
     /** @var string */
     protected $urlResourceOwnerDetails = 'https://graph.microsoft.com/v1.0/me';
 
+    /**
+     * @param array $options
+     * @param array $collaborators
+     * @param string $urlAuthorize Base url for authorization.
+     */
+    public function __construct(
+        array $options = [],
+        array $collaborators = [],
+        string $urlAuthorize = 'https://login.microsoftonline.com'
+    ) {
+        $this->urlAuthorize = $urlAuthorize;
+        parent::__construct($options, $collaborators);
+    }
+
     /**
      * Get authorization url to begin OAuth flow
      *