diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/AuthController.cs b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/AuthController.cs
index 91d13a81..314f4d90 100644
--- a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/AuthController.cs
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/AuthController.cs
@@ -40,7 +40,7 @@ public partial class AuthController(IOptions<AuthTokenKeys> authTokenKeyOptions,
     /// <response code="401">Wenn es kein zugelassenes Cookie gibt, wird „nicht zugelassen“ zurückgegeben.</response>
     [ProducesResponseType(typeof(void), StatusCodes.Status200OK)]
     [ProducesResponseType(typeof(void), StatusCodes.Status401Unauthorized)]
-    [Authorize(Policy = AuthPolicy.Sender)]
+    [Authorize(AuthenticationSchemes = AuthScheme.Sender)]
     [HttpPost("logout")]
     public IActionResult Logout()
     {
diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/DocumentController.cs b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/DocumentController.cs
index f54780be..b1791dc0 100644
--- a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/DocumentController.cs
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/DocumentController.cs
@@ -30,7 +30,7 @@ public class DocumentController(IMediator mediator, IAuthorizationService authSe
     /// <param name="query">Encoded envelope key.</param>
     /// <param name="cancel">Cancellation token.</param>
     [HttpGet]
-    [Authorize(Policy = AuthPolicy.Sender)]
+    [Authorize(AuthenticationSchemes = AuthScheme.Sender)]
     public async Task<IActionResult> GetDocument(CancellationToken cancel, [FromQuery] ReadDocumentQuery? query = null)
     {
         if (query is null)
diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EmailTemplateController.cs b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EmailTemplateController.cs
index 78bd42ac..bc58737c 100644
--- a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EmailTemplateController.cs
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EmailTemplateController.cs
@@ -24,7 +24,7 @@ namespace EnvelopeGenerator.Server.Controllers;
 /// </param>
 [Route("api/[controller]")]
 [ApiController]
-[Authorize(Policy = AuthPolicy.Sender)]
+[Authorize(AuthenticationSchemes = AuthScheme.Sender)]
 public class EmailTemplateController(IMediator mediator) : ControllerBase
 {
     /// <summary>
diff --git a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EnvelopeReceiverController.cs b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EnvelopeReceiverController.cs
index 76e53604..1ca838aa 100644
--- a/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EnvelopeReceiverController.cs
+++ b/EnvelopeGenerator.Server/EnvelopeGenerator.Server/Controllers/EnvelopeReceiverController.cs
@@ -150,7 +150,7 @@ public class EnvelopeReceiverController : ControllerBase
     /// <response code="400">Wenn ein Fehler im HTTP-Body auftritt</response>
     /// <response code="401">Wenn kein autorisierter Token vorhanden ist</response>
     /// <response code="500">Es handelt sich um einen unerwarteten Fehler. Die Protokolle sollten überprüft werden.</response>
-    [Authorize]
+    [Authorize(AuthenticationSchemes = AuthScheme.Sender)]
     [HttpPost]
     public async Task<IActionResult> CreateAsync([FromBody] CreateEnvelopeReceiverCommand request, CancellationToken cancel)
     {
@@ -214,6 +214,10 @@ public class EnvelopeReceiverController : ControllerBase
                 if (reader.Read())
                 {
                     bool outSuccess = reader.GetBoolean(0);
+                    if (!outSuccess)
+                        _logger.LogWarning(
+                            "PRSIG_API_ADD_DOC_RECEIVER_ELEM returned OUT_SUCCESS=false. DOC_ID={DocId}, RECEIVER_ID={ReceiverId}, Page={Page}",
+                            document.Id, rcv.Id, sign.Page);
                 }
             }
         #endregion
@@ -221,8 +225,6 @@ public class EnvelopeReceiverController : ControllerBase
         #region Create history
         // ENV_UID, STATUS_ID, USER_ID,
         string sql_hist = @"
-                USE [DD_ECM]
-
                 DECLARE @OUT_SUCCESS bit;
 
                 EXEC [dbo].[PRSIG_API_ADD_HISTORY_STATE]
@@ -244,6 +246,10 @@ public class EnvelopeReceiverController : ControllerBase
             if (reader.Read())
             {
                 bool outSuccess = reader.GetBoolean(0);
+                if (!outSuccess)
+                    _logger.LogWarning(
+                        "PRSIG_API_ADD_HISTORY_STATE returned OUT_SUCCESS=false. EnvelopeUuid={EnvelopeUuid}",
+                        envelope.Uuid);
             }
         }
         #endregion