Adds the user name as a separate field

app/Nova/User.php

@@ -36,7 +36,7 @@ final class User extends Resource
      * @var array
      */
     public static $search = [
-        'id', 'name', 'email', 'department', 'job_title',
+        'id', 'name', 'username', 'email', 'department', 'job_title',
     ];
 
     /**
@@ -59,12 +59,19 @@ public function fields(NovaRequest $request): array
                 ->rules('required', 'max:255')
                 ->help('The user\'s full name, imported from Azure AD when they first log in.'),
 
+            Text::make('Username')
+                ->sortable()
+                ->rules('required', 'max:255')
+                ->creationRules('unique:users,username')
+                ->updateRules('unique:users,username,{{resourceId}}')
+                ->help('The user\'s Azure AD principal name (UPN), used to identify them when logging in via SSO.'),
+
             Text::make('Email')
                 ->sortable()
                 ->rules('required', 'email', 'max:254')
                 ->creationRules('unique:users,email')
                 ->updateRules('unique:users,email,{{resourceId}}')
-                ->help('The user\'s email address, used to identify them when logging in via Azure AD.'),
+                ->help('The user\'s email address.'),
 
             Text::make('Azure ID', 'azure_id')
                 ->onlyOnDetail()