diff --git a/src/Managing.Application/Users/UserService.cs b/src/Managing.Application/Users/UserService.cs
index 3e7516e..fcc2355 100644
--- a/src/Managing.Application/Users/UserService.cs
+++ b/src/Managing.Application/Users/UserService.cs
@@ -54,7 +54,7 @@ public class UserService : IUserService
                 $"Message not good : {message} - Address : {address} - User : {name} - Signature : {signature}");
         }
 
-        if (!_authorizedAddresses.Contains(recoveredAddress.ToLower()))
+        if (!_authorizedAddresses.Any(a => string.Equals(a, recoveredAddress, StringComparison.OrdinalIgnoreCase)))
         {
             _logger.LogWarning($"Address {recoveredAddress} not authorized");
             throw new Exception("Address not authorized");