diff --git a/Core/PixelEvent.swift b/Core/PixelEvent.swift
index 527ce9c495..be65c36f6a 100644
--- a/Core/PixelEvent.swift
+++ b/Core/PixelEvent.swift
@@ -499,6 +499,7 @@ extension Pixel {
         case syncRemoveDeviceError
         case syncDeleteAccountError
         case syncLoginExistingAccountError
+        case syncWrongEnvironment
 
         case swipeTabsUsed
         case swipeTabsUsedDaily
@@ -1004,6 +1005,8 @@ extension Pixel.Event {
         case .syncDeleteAccountError: return "m_d_sync_delete_account_error"
         case .syncLoginExistingAccountError: return "m_d_sync_login_existing_account_error"
 
+        case .syncWrongEnvironment: return "m_d_sync_wrong_environment_u"
+
         case .swipeTabsUsed: return "m_swipe-tabs-used"
         case .swipeTabsUsedDaily: return "m_swipe-tabs-used-daily"
 
diff --git a/DuckDuckGo/AppDelegate.swift b/DuckDuckGo/AppDelegate.swift
index 3bd12868ed..72323da1e2 100644
--- a/DuckDuckGo/AppDelegate.swift
+++ b/DuckDuckGo/AppDelegate.swift
@@ -399,6 +399,10 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
         guard !testing else { return }
 
         syncService.initializeIfNeeded()
+        if syncService.authState == .active &&
+            (InternalUserStore().isInternalUser == false && syncService.serverEnvironment == .development) {
+            UniquePixel.fire(pixel: .syncWrongEnvironment)
+        }
         syncDataProviders.setUpDatabaseCleanersIfNeeded(syncService: syncService)
 
         if !(overlayWindow?.rootViewController is AuthenticationViewController) {