I checked CloudKit Console > Monitor > Logs for iCloud.com.matrixqlc.photodiet.sync in the Development environment. The visible entries appear to be CloudKit Console WEB operations only. For example: database: PUBLIC operationType: ZoneFetch / SubscriptionFetch overallStatus: SUCCESS interfaceType: WEB I could not find the client-side PRIVATE database failures or the RequestUUIDs from the iOS app in the visible logs. The failures we are reporting are from iOS client operations against the private database, such as allRecordZones(), databaseChanges(since:nil), allSubscriptions(), fetch zone metadata, save/fetch/query records, all returning CKErrorDomain 15 / CKInternalErrorDomain 2000 / HTTP 500 for this specific container. Could you please check Apple-side internal logs using the RequestUUIDs we provided?