diff --git a/SportsTime/SportsTimeApp.swift b/SportsTime/SportsTimeApp.swift
index dfdbd99..9672693 100644
--- a/SportsTime/SportsTimeApp.swift
+++ b/SportsTime/SportsTimeApp.swift
@@ -8,6 +8,7 @@
 import SwiftUI
 import SwiftData
 import BackgroundTasks
+import CloudKit
 
 @main
 struct SportsTimeApp: App {
@@ -238,6 +239,21 @@ struct BootstrappedContentView: View {
         let log = SyncLogger.shared
         log.log("🔄 [SYNC] Starting background sync...")
 
+        // Log diagnostic info for debugging CloudKit container issues
+        let bundleId = Bundle.main.bundleIdentifier ?? "unknown"
+        let container = CKContainer.default()
+        let containerId = container.containerIdentifier ?? "unknown"
+        log.log("🔧 [DIAG] Bundle ID: \(bundleId)")
+        log.log("🔧 [DIAG] CKContainer.default(): \(containerId)")
+        if let entitlementContainers = Bundle.main.object(forInfoDictionaryKey: "com.apple.developer.icloud-container-identifiers") as? [String] {
+            log.log("🔧 [DIAG] Entitlement containers: \(entitlementContainers.joined(separator: ", "))")
+        }
+        if let accountStatus = try? await container.accountStatus() {
+            log.log("🔧 [DIAG] iCloud account status: \(accountStatus.rawValue) (0=couldNotDetermine, 1=available, 2=restricted, 3=noAccount)")
+        } else {
+            log.log("🔧 [DIAG] iCloud account status: failed to check")
+        }
+
         // Only reset stale syncInProgress flags; do not clobber an actively running sync.
         let syncState = SyncState.current(in: context)
         if syncState.syncInProgress {