Looking more into this, it looks like this regression only occurs when authenticating via JWT so some server side regression broke iTMSTransporter's ability to do JWT auth. This also reproduces with the macOS version of iTMSTransporter.

We are also impacted by this. This appears to be some kind of server-side regression because Apple is now rejecting assetFile / assetDescription pairs that previously uploaded successfully. Using iTMSTransporter 4.0.0.4 on Linux an assetFile / assetDescription pair uploaded successfully on Sept. 25th. As of Sept. 30th that same assetFile / assetDescription is now being rejected with: [2025-10-01 21:43:07 UTC] <main> DEBUG: Setting System property: DataCenters = contentdelivery02.itunes.apple.com,contentdelivery01.itunes.apple.com [2025-10-01 21:43:07 UTC] <main> DEBUG: Setting System property: DataCenters.host = contentdelivery02.itunes.apple.com [2025-10-01 21:43:07 UTC] <main> DEBUG: Setting System property: DataCenters.setBy = Defaults.properties [2025-10-01 21:43:08 UTC] <main> INFO: Configuring logging... [2025-10-01 21:43:08 UTC] <main> INFO: Logging level set to eXtreme [2025-10-01 21:43:10 UTC] <main> DEBUG: SMART-CLIENT: initializing data center locking ops: [authenticateForSession, validateAssets] [2025-10-01 21:43:10 UTC] <main> DEBUG: SMART-CLIENT: initializing data centers with: [contentdelivery02.itunes.apple.com, contentdelivery01.itunes.apple.com] [2025-10-01 21:43:11 UTC] <main> INFO: iTMSTransporter : iTunes Store Transporter [4.1.0] [2025-10-01 21:43:11 UTC] <main> INFO: OS identifier: Linux <redacted> [2025-10-01 21:43:11 UTC] <main> INFO: Memory: <redacted> [2025-10-01 21:43:11 UTC] <main> DEBUG: SMART-CLIENT: getCurrent(); current data center is null [2025-10-01 21:43:11 UTC] <main> DEBUG: SMART-CLIENT: getCurrent(); iterator was null, setting it [2025-10-01 21:43:11 UTC] <main> DEBUG: SMART-CLIENT: getCurrent(); setting current data center to: contentdelivery02.itunes.apple.com [2025-10-01 21:43:11 UTC] <main> ERROR: No value present Package Summary: 1 package(s) were not uploaded because they had problems: /<redacted>/<redacted>.pkg - Error Messages: No value present [2025-10-01 21:43:11 UTC] <main> DBG-X: Returning 1 This reproduces with both iTMSTransporter 4.0.0.4 and after upgrading to the latest 4.1.0.19 version.