ApplyLayouts fails to apply layout to package document

Hello,

I have created the following draft package:

DocumentPackage draftDocumentPackage = PackageBuilder
                .NewPackageNamed(Path.GetFileNameWithoutExtension(pdfFile))
                .WithSigner(SignerBuilder
                            .NewSignerWithEmail(drow["_EmailAddress"])
                            .WithFirstName(drow["_FirstName"])
                            .WithLastName(drow["_LastName"]))
                .WithDocument(DocumentBuilder
                            .NewDocumentNamed(Path.GetFileNameWithoutExtension(pdfFile))
                            .WithId(drow["DocId"])
                            .WithDescription("Document with applied layout description.")
                            .FromFile(pdfFile))
                .Build();

            PackageId draftPackageId = OneSpanClient.CreatePackage(draftDocumentPackage);
 

The layout is previously and manually created in eSign, so I retrieve the layout:
 

        int i = 1;
        int maxNumberOfLayouts = 5;
        EslClient OneSpanClient = new EslClient(OLEAPIKEY, OLEURL);

        // The first step is to retrieve the layouts from the first page. 
        // N number of layouts are retrieved at a time but this can be set to any number and could be configurable if necessary

        IList<DocumentPackage> layouts = OneSpanClient.LayoutService.GetLayouts(Direction.DESCENDING, new PageRequest(i, maxNumberOfLayouts));
        IList<DocumentPackage> layoutList = new List<DocumentPackage>();
        int count = layouts.Count;
        if (count == 0) LogFile.Write(3, "There are NO layouts to retrieve from the OneSpan eSign!");

        while (count != 0) {

            foreach (DocumentPackage layout in layouts) {

                // This is where the layout name and id is retrieved.
                // Check app.config for layout name
                if (layout.Name.ToUpper() == appConfig.LayoutName.ToUpper()) {
                    layoutList.Add(layout);
                    i++;
                }
            }

            // Finally, retrieve the next N number of layouts from the second page and start over up until you’ve retrieved all your layouts.

            layouts = OneSpanClient.LayoutService.GetLayouts(Direction.DESCENDING, new PageRequest(i, maxNumberOfLayouts));
            count = layouts.Count;
        }

Then I apply the layout to the package:

            EslClient OneSpanClient = new EslClient(OLEAPIKEY, OLEURL);
            bool LayoutApplied = false;

           //apply layout to one or more packages
           foreach (PackageId packageId in draftPackageList) {

                foreach (DocumentPackage layout in layoutList) {

                     var layoutId = layout.Id.ToString();
                     var layoutName = layout.Name;
                     IList<Document> documentList = layout.Documents;

                     foreach (Document document in documentList) {

                         var documentId = document.Id;
                         if (layoutName.Contains(document.Name)) {
                              try {
                                        OneSpanClient.LayoutService.ApplyLayout(packageId, documentId, layoutId);
                                        LayoutApplied = true;
                                   }
                                   catch (Exception ex) {
                                        LogFile.Write(1, $"{ex.GetType().ToString()} while in {MethodBase.GetCurrentMethod().Name}. (" + ex.ToString() + ")");
                        }
                    }
                }
            }
        }
        return LayoutApplied;

I keep getting this Exception:

10:49:21.665: Silanis.ESL.SDK.EslServerException while in ApplyLayouts. (Silanis.ESL.SDK.EslServerException: Could not apply layout. Exception: The remote server returned an error: (404) Not Found.

HTTP POST on URI https://sandbox.esignlive.com/api/packages/oOXqHr10kw2vYIJExcdOZCignZQ=/documents/8f18c94ecc4eb5ff90a4b74324e514df207b1d6d4cda057f/layout?layoutId=ePiIFQtKCoE04Tmmu6YztAmdTSs=.

Optional details: {"messageKey":"error.validation.packageManagement.invalidDocument","technical":"Document: 8f18c94ecc4eb5ff90a4b74324e514df207b1d6d4cda057f was not found","message":"Can not find specified document.","code":404,"name":"Resource Not Found"} ---> Silanis.ESL.SDK.EslServerException: The remote server returned an error: (404) Not Found. HTTP POST on URI https://sandbox.esignlive.com/api/packages/oOXqHr10kw2vYIJExcdOZCignZQ=/documents/8f18c94ecc4eb5ff90a4b74324e514df207b1d6d4cda057f/layout?layoutId=ePiIFQtKCoE04Tmmu6YztAmdTSs=. Optional details: {"messageKey":"error.validation.packageManagement.invalidDocument","technical":"Document: 8f18c94ecc4eb5ff90a4b74324e514df207b1d6d4cda057f was not found","message":"Can not find specified document.","code":404,"name":"Resource Not Found"} ---> System.Net.WebException: The remote server returned an error: (404) Not Found.
   at System.Net.HttpWebRequest.GetResponse()
   at Silanis.ESL.SDK.Internal.HttpMethods.PostHttp(String apiToken, String path, Byte[] content)

   --- End of inner exception stack trace ---
   at Silanis.ESL.SDK.Internal.HttpMethods.PostHttp(String apiToken, String path, Byte[] content)
   at Silanis.ESL.SDK.RestClient.Post(String path, String jsonPayload)
   at Silanis.ESL.SDK.LayoutApiClient.ApplyLayout(String packageId, String documentId, String layoutId)

   --- End of inner exception stack trace ---
   at Silanis.ESL.SDK.LayoutApiClient.ApplyLayout(String packageId, String documentId, String layoutId)
   at Silanis.ESL.SDK.LayoutService.ApplyLayout(PackageId packageId, String documentId, String layoutId)
   at IdentifiFormToPDF.Program.ApplyLayouts(IList`1 draftPackageList, IList`1 layoutList) in C:\Solutions\Client Shared\Non-Core Specific\IdentifiFormToPDF\IdentifiFormToPDF\Program.cs:line 811)

Why can't eSign find the layout to apply to the package?