* Default Scan library to on for new accounts from Upsert / Mkb79 import (matches GUI)

* CLI liberate: print short license-denial reasons to stderr
* GUI: message when stoplight can’t queue (e.g. absent from last scan)

Source/AudibleUtilities/AccountsSettings.cs

@@ -88,7 +88,8 @@ public class AccountsSettings : IUpdatable
 		var l = Localization.Get(locale);
 		var id = new Identity(l);
 
-		var account = new Account(accountId) { IdentityTokens = id };
+		// Match GUI default for new rows (WinForms/Avalonia): include account in library scans.
+		var account = new Account(accountId) { IdentityTokens = id, LibraryScan = true };
 		Add(account);
 		return account;
 	}

Source/AudibleUtilities/Mkb79Auth.cs

@@ -217,7 +217,8 @@ public partial class Mkb79Auth
 		{
 			DecryptKey = ActivationBytes,
 			AccountName = $"{email} - {Locale.Name}",
-			IdentityTokens = new Identity(Locale)
+			IdentityTokens = new Identity(Locale),
+			LibraryScan = true,
 		};
 
 		account.IdentityTokens.Update(

Source/LibationCli/ContentLicenseDeniedCliSummary.cs

@@ -0,0 +1,26 @@
+using AudibleApi;
+using System;
+using System.Collections.Generic;
+
+namespace LibationCli;
+
+internal static class ContentLicenseDeniedCliSummary
+{
+	/// <summary>Short lines for stderr when Audible denies a download license; mirrors log detail without dumping the full JSON.</summary>
+	public static IEnumerable<string> Lines(ContentLicenseDeniedException ex)
+	{
+		ArgumentNullException.ThrowIfNull(ex);
+
+		yield return "Audible denied a content license (download not allowed for this account/title).";
+		yield return ex.Message;
+
+		if (ex.Ownership?.Message is { } own && !string.IsNullOrWhiteSpace(own))
+			yield return $"Ownership: {own}";
+		if (ex.Client?.Message is { } cli && !string.IsNullOrWhiteSpace(cli))
+			yield return $"Client: {cli}";
+		if (ex.Membership?.Message is { } mem && !string.IsNullOrWhiteSpace(mem))
+			yield return $"Membership: {mem}";
+		if (ex.AYCL?.Message is { } aycl && !string.IsNullOrWhiteSpace(aycl))
+			yield return $"AYCL (aka: Plus catalog): {aycl}";
+	}
+}

Source/LibationCli/Options/ListAccountsOptions.cs

@@ -6,7 +6,7 @@ using System.Threading.Tasks;
 
 namespace LibationCli;
 
-[Verb("list-accounts", HelpText = "List configured Audible accounts, locale, scan flag, and whether stored credentials are valid.")]
+[Verb("list-accounts", HelpText = "List configured Audible accounts: locale, whether the account is included in automatic GUI scans ('Scan library'), and whether stored credentials are valid.")]
 internal class ListAccountsOptions : OptionsBase
 {
 	[Option('b', "bare", HelpText = "Print tab-separated values without table borders (account id, name, locale, scan library, authenticated).")]

Source/LibationCli/Options/_ProcessableOptionsBase.cs

@@ -1,4 +1,5 @@
 using ApplicationServices;
+using AudibleApi;
 using CommandLine;
 using DataLayer;
 using FileLiberator;
@@ -121,6 +122,12 @@ public abstract class ProcessableOptionsBase : OptionsBase
 				Serilog.Log.Logger.Error(errorMessage);
 			}
 		}
+		catch (ContentLicenseDeniedException clEx)
+		{
+			foreach (var line in ContentLicenseDeniedCliSummary.Lines(clEx))
+				Console.Error.WriteLine(line);
+			Serilog.Log.Logger.Error(clEx, "Content license denied {@DebugInfo}", new { Book = libraryBook.LogFriendly() });
+		}
 		catch (Exception ex)
 		{
 			var msg = "Error processing book. Skipping. This book will be tried again on next attempt. For options of skipping or marking as error, retry with main Libation app.";

Source/LibationUiBase/ProcessQueue/ProcessQueueViewModel.cs

@@ -1,5 +1,6 @@
 using ApplicationServices;
 using DataLayer;
+using FileLiberator;
 using LibationFileManager;
 using LibationUiBase.Forms;
 using LibationUiBase;
@@ -137,21 +138,43 @@ public class ProcessQueueViewModel : ReactiveObject
 			var item = libraryBooks[0];
 
 			if (item.AbsentFromLastScan)
+			{
+				Serilog.Log.Logger.Warning("Download not queued: {libraryBook} is absent from the last library scan.", item.LogFriendly());
+				MessageBoxBase.Show(
+					"This title is marked absent from your last library scan.\n\nRun Scan (or `libationcli scan`) so Libation can refresh your library, then try again.",
+					"Library scan required",
+					MessageBoxButtons.OK,
+					MessageBoxIcon.Information);
 				return false;
-			else if (item.NeedsBookDownload)
+			}
+			if (item.NeedsBookDownload)
 			{
 				RemoveCompleted(item);
 				Serilog.Log.Logger.Information("Begin single library book backup of {libraryBook}", item);
 				AddDownloadDecrypt([item], config);
 				return true;
 			}
-			else if (item.NeedsPdfDownload)
+			if (item.NeedsPdfDownload)
 			{
 				RemoveCompleted(item);
 				Serilog.Log.Logger.Information("Begin single pdf backup of {libraryBook}", item);
 				AddDownloadPdf([item], config);
 				return true;
 			}
+
+			Serilog.Log.Logger.Warning(
+				"Download not queued: single-item backup not applicable for {libraryBook} (book status or type does not request download).",
+				item.LogFriendly());
+			if (!item.Book.AudioExists)
+			{
+				MessageBoxBase.Show(
+					"Libation could not queue a download for this title.\n\n"
+					+ "If it should be downloadable: confirm it is not already liberated, try \"Set download status\" to Not downloaded, or check whether a library scan is required.",
+					"Download not queued",
+					MessageBoxButtons.OK,
+					MessageBoxIcon.Information);
+			}
+			return false;
 		}
 		else
 		{

Source/_Tests/AudibleUtilities.Tests/AccountTests.cs

@@ -425,6 +425,7 @@ public class upsert : AccountsTestBase
 		var acct = accountsSettings.GetAccount("cng", "us");
 		acct.BeNotNull();
 		acct.AccountId.Should().Be("cng");
+		acct.LibraryScan.Should().BeTrue();
 	}
 
 	[TestMethod]

docs/advanced/command-line-interface.md

@@ -102,6 +102,8 @@ libationcli list-accounts --bare
 
 `--bare` (`-b`) prints tab-separated values with no table: account id, name, locale, scan library (`yes` / `no`), authenticated (`yes` / `no`), for scripts and `cut` / `awk`.
 
+**Scan library** (`yes` / `no`) is the same checkbox as "Include in library scan?" in Accounts: it controls whether the main Libation app includes that account in automatic scans (startup / periodic scan behavior). It does **not** restrict `libationcli scan` with no arguments, which still imports from every configured account unless you pass specific account nicknames or ids.
+
 If no accounts exist yet, the CLI prints `No accounts configured.` and exits successfully.
 
 ## Scan All Libraries