Zoom webinar SDK returns null

[Mukund1973]

We have been using Zoom Meeting SDK in our applications for iOS and Android (mobile) and Windows UWP ( Desktop) since a while.

On December 12th 2025, our mobile apps (iOS + Android) stopped joining live classes, while the desktop/UWP app continues to work.

Issue Summary

• Platform affected: iOS (primary) and Android (also impacted)
• Platform not affected: Windows UWP desktop app
• User-visible symptom: Mobile shows “Unable to connect zoom” / join fails for live classes
• Root error: MobileRTCAuthError.tokenWrong (raw value 11) during SDK authentication on iOS, more. Same with Android
• SDK auth state: MobileRTC.shared().isRTCAuthorized = false
• Meeting SDK Version: 6.0.2.21328

iOS Debug Logs:

ZOOM AUTH: MobileRTCAuthError(rawValue: 11) raw=11

ZOOM isRTCAuthorized=false

ZOOM callStack:

0 ACE Online.debug.dylib 0x0000000104cf1574 $s10ACE_Online11AppDelegateC21onMobileRTCAuthReturnyySo0fG5ErrorVF + 884

1 ACE Online.debug.dylib 0x0000000104cf2298 $s10ACE_Online11AppDelegateC21onMobileRTCAuthReturnyySo0fG5ErrorVFTo + 44

2 libdispatch.dylib 0x000000010bc78584 _dispatch_call_block_and_release + 32

3 libdispatch.dylib 0x000000010bc92064 _dispatch_client_callout + 16

4 libdispatch.dylib 0x000000010bcb2f98 _dispatch_main_queue_drain.cold.5 + 876

5 libdispatch.dylib 0x000000010bc88548 _dispatch_main_queue_drain + 180

6 libdispatch.dylib 0x000000010bc88484 _dispatch_main_queue_callback_4CF + 44

7 CoreFoundation 0x000000019c112c30 AE3C9338-0166-397A-9643-356B14F6EE58 + 445488

8 CoreFoundation 0x000000019c0b6394 AE3C9338-0166-397A-9643-356B14F6EE58 + 66452

9 CoreFoundation 0x000000019c0b7adc

Sample token used:

"eyAiYWxnIjogIkhTMjU2IiwgInR5cCI6ICJKV1QiIH0.eyAiYXBwS2V5IjogImhZWG1Zb1BtVVZJbUl6ejExU1o4Q3RHYWdoMEdDRFZzQU5kUyIsICJpYXQiOiAxNzY1NjQ0MjI5LCAiZXhwIjogMTc2NTY1MTQyOSwgInRva2VuRXhwIjogMTc2NTY1MTQyOSwgInVzZXJJRCI6ICIxMjM0NTY3ODkwIiwgInVzZXJOYW1lIjogIkpvaG4gRG9lIiB9.TcRU3PS32cPUk4iG7_Hq7Jp8rX_OG6zDEsECz2qD6Xo"

Failing IOS Code Snippet:
"

if let meetingService = MobileRTC.shared().getMeetingService(),

let zoomMeet = zoomMeet {

   meetingService.delegate = self

   let joinMeetingParameters = MobileRTCMeetingJoinParam()

   joinMeetingParameters.meetingNumber = zoomMeet.meetingID

   joinMeetingParameters.password = zoomMeet.password

   joinMeetingParameters.webinarToken = zoomMeet.token

   meetingService.joinMeeting(with: joinMeetingParameters)

} else {

   print("Failed to fetch meetingService")

}

Can you validate if any recent enforcement/policy changes might cause sudden auth rejections for existing integrations?

Can you confirm what exact JWT claims are required for the current iOS Meeting SDK auth (e.g., whether sdkKey must be present in addition to appKey)?

The claims in the Desktop App(Working) has sdkKey, role, and mn. We have tried updating these in mobile but no luck.

Please advise on the likely causes issue and the recommended corrective steps.

Please note our "There is a business impact due mobile app outage."