diff --git a/src/comissions.app.api/Controllers/RequestsController.cs b/src/comissions.app.api/Controllers/RequestsController.cs
index 9c0b537..6911c86 100644
--- a/src/comissions.app.api/Controllers/RequestsController.cs
+++ b/src/comissions.app.api/Controllers/RequestsController.cs
@@ -919,7 +919,7 @@ public class RequestsController : Controller
             .Where(x=>x.UserId==User.GetUserId())
             .CountAsync();
         
-        var artist = await _dbContext.UserArtists.FirstOrDefaultAsync(x=>x.Id==model.ArtistId);
+        var artist = await _dbContext.UserArtists.Include(x=>x.User).FirstOrDefaultAsync(x=>x.User.DisplayName==model.ArtistDisplayName);
         if(artist==null)
             return NotFound("Artist not found.");
         
@@ -932,7 +932,7 @@ public class RequestsController : Controller
             Message = model.Message,
             RequestDate = DateTime.UtcNow,
             UserId = userId,
-            ArtistId = model.ArtistId,
+            ArtistId = artist.Id,
             Accepted = false,
             AcceptedDate = null,
             Declined = false,
diff --git a/src/comissions.app.api/Controllers/UserController.cs b/src/comissions.app.api/Controllers/UserController.cs
index e9775fb..1de79f2 100644
--- a/src/comissions.app.api/Controllers/UserController.cs
+++ b/src/comissions.app.api/Controllers/UserController.cs
@@ -35,6 +35,10 @@ public class UserController : Controller
     {
         var userId = User.GetUserId();
         var existingUser = await _dbContext.Users.FirstAsync(user=>user.Id==userId);
+        
+        if(_dbContext.Users.Any(x=>x.DisplayName==model.DisplayName && x.Id!=userId))
+            return BadRequest("Display name is already in use.");
+        
         var updatedUser = model.ToEntity(existingUser);
         updatedUser = _dbContext.Users.Update(updatedUser).Entity;
         await _dbContext.SaveChangesAsync();
diff --git a/src/comissions.app.api/Middleware/UserMiddleware.cs b/src/comissions.app.api/Middleware/UserMiddleware.cs
index e657086..0435e0d 100644
--- a/src/comissions.app.api/Middleware/UserMiddleware.cs
+++ b/src/comissions.app.api/Middleware/UserMiddleware.cs
@@ -31,10 +31,12 @@ public class UserMiddleware
 
             if (user == null)
             {
+                var displayName = context.User.Claims.FirstOrDefault(x=>x.Type==ClaimTypes.Name)?.Value ?? "Anonymous";
+                    displayName = $"{displayName}#{Guid.NewGuid().ToString().Substring(0, 4)}";
                 user = new User
                 {
                     Id = userId, 
-                    DisplayName = context.User.Claims.FirstOrDefault(x=>x.Type==ClaimTypes.Name)?.Value ?? "Anonymous", 
+                    DisplayName = displayName, 
                     Biography = string.Empty,
                     Email = context.User.Claims.FirstOrDefault(x=>x.Type==ClaimTypes.Email)?.Value ?? string.Empty,
                 };
diff --git a/src/comissions.app.api/Models/Request/RequestCreateModel.cs b/src/comissions.app.api/Models/Request/RequestCreateModel.cs
index 1918385..75607ac 100644
--- a/src/comissions.app.api/Models/Request/RequestCreateModel.cs
+++ b/src/comissions.app.api/Models/Request/RequestCreateModel.cs
@@ -2,7 +2,7 @@ namespace comissions.app.database.Models.Request;
 
 public class RequestCreateModel
 {
-    public int ArtistId { get; set; }
+    public string ArtistDisplayName { get; set; }
     public string Message { get; set; }
     public decimal Amount { get; set; }
 }
\ No newline at end of file