Fix: Sign-in user if exists

src/Infrastructure/Services/UserService.cs

@@ -84,8 +84,12 @@ public class UserService(UserManager<ApplicationUser> userManager, IHttpContextA
     }
 }
 
+// If we need to add special characters we can alternate between 2 pools.
 public class RandomGenerator
 {
+    // For the moment, numbers and special characters don't work because
+    // the random generator is designed to handle a single integer.
+    // We can modify this in the future.
     private const string LetterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
                                        + "0123456789"
                                        + "!@#$%^&*()_+"