diff --git a/CHANGELOG.md b/CHANGELOG.md
index f4707e2..59de2ee 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Fixed
+- "Not configured" error messages now mention `tfvc.adoBaseUrl` as an alternative to `tfvc.adoOrg` for on-prem installs. Previously both the SCM error toast (`src/extension.ts`) and the review-diff placeholder text (`src/providers/fileContent.ts`) told users to set `tfvc.adoOrg`, sending on-prem users chasing a field they don't need — the underlying check has always accepted either.
+
 ## [0.4.0]
 
 ### Changed
diff --git a/src/extension.ts b/src/extension.ts
index 1fdd22f..e29977a 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -168,8 +168,8 @@ export async function activate(context: vscode.ExtensionContext): Promise<void>
 
     function notConfigured(): void {
         vscode.window.showErrorMessage(
-            'TFVC: Not configured. Run "TFVC: Set PAT", configure tfvc.adoOrg and tfvc.adoProject in settings, ' +
-            'then run "TFVC: Initialize Workspace".'
+            'TFVC: Not configured. Run "TFVC: Set PAT", set tfvc.adoProject and either tfvc.adoOrg (cloud) ' +
+            'or tfvc.adoBaseUrl (on-prem) in settings, then run "TFVC: Initialize Workspace".'
         );
     }
 
diff --git a/src/providers/fileContent.ts b/src/providers/fileContent.ts
index a7edde4..c568294 100644
--- a/src/providers/fileContent.ts
+++ b/src/providers/fileContent.ts
@@ -32,7 +32,7 @@ export class ReviewFileContentProvider implements vscode.TextDocumentContentProv
 
     async provideTextDocumentContent(uri: vscode.Uri): Promise<string> {
         if (!this.restClient) {
-            return '// ADO REST client not configured. Set tfvc.pat and tfvc.adoOrg in settings.';
+            return '// ADO REST client not configured. Set tfvc.pat and either tfvc.adoOrg (cloud) or tfvc.adoBaseUrl (on-prem) in settings.';
         }
 
         const cacheKey = uri.toString();