From 6b72880c0bccf57365f96b58cc7fb934cb56be16 Mon Sep 17 00:00:00 2001
From: Nikolaj Geisle <70372949+Zeegaan@users.noreply.github.com>
Date: Tue, 19 Sep 2023 09:01:35 +0200
Subject: [PATCH] fix: ensured that allowed user name characters are supported
 in backoffice users as well (#14810) (#14825)

Co-authored-by: Arkadiusz Biel <bielu@bielu.com.pl>
---
 .../Security/ConfigureBackOfficeIdentityOptions.cs              | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/Umbraco.Web.BackOffice/Security/ConfigureBackOfficeIdentityOptions.cs b/src/Umbraco.Web.BackOffice/Security/ConfigureBackOfficeIdentityOptions.cs
index e3f897018a..211528afab 100644
--- a/src/Umbraco.Web.BackOffice/Security/ConfigureBackOfficeIdentityOptions.cs
+++ b/src/Umbraco.Web.BackOffice/Security/ConfigureBackOfficeIdentityOptions.cs
@@ -38,6 +38,8 @@ public sealed class ConfigureBackOfficeIdentityOptions : IConfigureOptions<BackO
         options.SignIn.RequireConfirmedPhoneNumber = false; // not implemented
 
         options.User.RequireUniqueEmail = true;
+        // Support validation of users names using Down-Level Logon Name format
+        options.User.AllowedUserNameCharacters = _securitySettings.AllowedUserNameCharacters;
 
         options.ClaimsIdentity.UserIdClaimType = ClaimTypes.NameIdentifier;
         options.ClaimsIdentity.UserNameClaimType = ClaimTypes.Name;