diff --git a/csharp/App/Backend/Database/User.cs b/csharp/App/Backend/Database/User.cs
index 77897bffd..ea2344aaf 100644
--- a/csharp/App/Backend/Database/User.cs
+++ b/csharp/App/Backend/Database/User.cs
@@ -81,23 +81,26 @@ public partial class Db
         }
         
         var jsonPayload = new JsonObject { ["name"] = user.Email, ["operations"] = new JsonArray{ "getObject", "listBucket" }, ["content"] = instList};
-        var expiration = DateTime.Now.AddHours(24);
+        var expiration = DateTime.Now.AddSeconds(60);
         
-        var signature = $"POST /v2/access-key\n{jsonPayload}\n\n\n{expiration}";
-        using var hmacSha1 = new HMACSHA1(Encoding.UTF8.GetBytes(secret));
+        var signature = $"POST /v2/access-key\n{jsonPayload}\n\n\n{((DateTimeOffset)expiration).ToUnixTimeSeconds()}";
+        using var hmacSha256 = new HMACSHA256(Encoding.UTF8.GetBytes(secret));
         
         signature = Encoding.UTF8
             .GetBytes(signature)
-            .Apply(hmacSha1.ComputeHash)
+            .Apply(hmacSha256.ComputeHash)
             .Apply(Convert.ToBase64String);
 
         var keyJson = url
-            .WithHeader("Authorization", $"EXO2-HMAC-SHA256 credential={apiKey},expires={((DateTimeOffset)expiration).ToUnixTimeSeconds()},signature={signature}")
-            .PostJsonAsync(jsonPayload.ToString())
+            .WithHeader("Authorization",
+                $"EXO2-HMAC-SHA256 credential={apiKey},expires={((DateTimeOffset)expiration).ToUnixTimeSeconds()},signature={signature}");
+        
+        
+        var result = keyJson.PostJsonAsync(jsonPayload.ToString())
             .ReceiveJson()
             .Result;
-
-        return SetUserS3ApiKey(user, keyJson.GetValue("key"));
+        return result;
+        // return SetUserS3ApiKey(user, keyJson.GetValue("key"));
     }
 
     public Result SetUserS3ApiKey(User user, String key)
diff --git a/csharp/App/Backend/db.sqlite b/csharp/App/Backend/db.sqlite
index ce3c81c14..92600a486 100644
Binary files a/csharp/App/Backend/db.sqlite and b/csharp/App/Backend/db.sqlite differ