diff --git a/src/applications/auth/controller/PhabricatorAuthRegisterController.php b/src/applications/auth/controller/PhabricatorAuthRegisterController.php
--- a/src/applications/auth/controller/PhabricatorAuthRegisterController.php
+++ b/src/applications/auth/controller/PhabricatorAuthRegisterController.php
@@ -11,6 +11,8 @@
     $viewer = $this->getViewer();
     $account_key = $request->getURIData('akey');
 
+    $invite = $this->loadInvite();
+
     if ($request->getUser()->isLoggedIn()) {
       return $this->renderError(pht('You are already logged in.'));
     }
@@ -25,7 +27,7 @@
       $is_default = true;
       $is_setup = true;
     } else {
-      list($account, $provider, $response) = $this->loadDefaultAccount();
+      list($account, $provider, $response) = $this->loadDefaultAccount($invite);
       $is_default = true;
     }
 
@@ -33,8 +35,6 @@
       return $response;
     }
 
-    $invite = $this->loadInvite();
-
     if (!$provider->shouldAllowRegistration()) {
       if ($invite) {
         // If the user has an invite, we allow them to register with any
@@ -532,7 +532,7 @@
       ));
   }
 
-  private function loadDefaultAccount() {
+  private function loadDefaultAccount($invite = false) {
     $providers = PhabricatorAuthProvider::getAllEnabledProviders();
     $account = null;
     $provider = null;
@@ -540,8 +540,10 @@
 
     foreach ($providers as $key => $candidate_provider) {
       if (!$candidate_provider->shouldAllowRegistration()) {
-        unset($providers[$key]);
-        continue;
+        if (!$invite) {
+          unset($providers[$key]);
+          continue;
+        }
       }
       if (!$candidate_provider->isDefaultRegistrationProvider()) {
         unset($providers[$key]);