SL2 for Teams Activity Notifications Not Working on iOS

[hashem-ebrahimi]

Hello Team,

We are experiencing an issue where CellTrust SL2 for Teams Activity Notifications are not appearing on iOS devices. Notifications are received on desktop, Android devices, and MS Teams but not on iOS mobile devices, despite correct settings.

Steps to Reproduce:
Configure SL2 for Teams notifications as per SL2 for Teams Known Behavior.
Send a message to a user with SL2 installed on iOS.
Observe that no banner notification appears.

Expected Behavior: Notifications should appear on iOS devices when a new message is received, and the badge count should increment.

Actual Behavior:

• No banner notification on iOS.
• Badge count does not increment.
• No Activity Notification is received. 

Environment Details:

• SL2 App Version: 1.1.0
• Microsoft Teams Version: 25185.408.3802.4072
• iOS Version: 26.0 (iPhone 15)

Additionally, we believe this issue may require direct collaboration with a Microsoft engineer or support specialist to diagnose the root cause. The behavior appears to be inconsistent across environments and devices, and we’ve already ruled out configuration errors and app-level issues.

We would appreciate the opportunity to work closely with someone from the Teams platform team to review logs, test scenarios, and validate notification flows specific to SL2 integration on iOS.

Additional information regarding accounts that have been setup for Microsoft testing is attached.

CellTrust SL2 for Teams - Microsoft Testing Credentials.pdf

[m365-agent-toolkit-assistant]

👋 Hi @hashem-ebrahimi,

Thank you for reporting this issue! We want to let you know that:

⏱️ Our team will personally review your issue
🎯 You can expect a response within 1 business day

✨ This is an AI-generated initial response
🤖 AI-Generated Preliminary Analysis:

This is a known issue affecting activity notifications from third-party Teams apps (including SL2) not appearing on iOS, while working on desktop and Android. Microsoft engineering has acknowledged and reproduced the bug, and several highly similar reports exist:

• GitHub Issue #12659: Activity notifications via Graph API do not appear on iOS.
• GitHub Issue #10354 and #11000: Notifications for published apps or activity feed items are missing on iOS.
• Workarounds are not available; the issue is platform-specific.

Recommended Next Steps:

1. Update the Teams app and iOS OS to the latest version and retest.
2. Share your manifest and a reproduction video with the Microsoft Teams engineering team (microsoftteamsdev@microsoft.com) as requested in similar threads.
3. Monitor linked GitHub issues for progress and fixes.

This is an open bug under investigation and not a configuration error. For more, follow GitHub Issue #12659 for updates.

✨We'd love your feedback! Please take a moment to fill out our survey.

---

Note: This is an automated first response generated by AI. A human team member will review your issue and provide a more detailed response soon. We appreciate your patience!

[Nivedipa-MSFT]

@hashem-ebrahimi - Thank you for bringing this issue to our attention.
To help us investigate the problem, please provide the following information and check the items below:

• Are notifications working for other Teams apps or chats on the affected iOS devices?
• Are notification permissions for Teams enabled in iOS Settings (Settings > Notifications > Teams)?
• Is Focus mode, Do Not Disturb, or Low Power Mode enabled on the device, which could suppress notifications?
• Is the SL2 app properly installed and signed in on the iOS device?
• Can the affected accounts receive notifications from other apps or bots in Teams?
• Does the issue occur for all users on iOS or only certain accounts or devices?
• Does the problem persist after reinstalling the SL2 app and/or Teams app on iOS?
• Have you tested on different iOS versions or device models to rule out device-specific issues?

If possible, could you please share a reproduction video for desktop, Android, and iOS, in case we need to raise a bug?

[hashem-ebrahimi]

Are notifications working for other Teams apps or chats on the affected iOS devices?
Yes, notifications from other Teams apps and chats are working correctly on the affected iOS devices. The issue is isolated to the SL2 for Teams app.

Are notification permissions for Teams enabled in iOS Settings (Settings > Notifications > Teams)?
Yes, notification permissions are fully enabled for Microsoft Teams in iOS Settings, including banners, sounds, and badges.

Is Focus mode, Do Not Disturb, or Low Power Mode enabled on the device, which could suppress notifications?
No, none of these modes are enabled. We’ve verified that Focus mode, Do Not Disturb, and Low Power Mode are all turned off during testing.

Is the SL2 app properly installed and signed in on the iOS device?
Yes, the SL2 app is properly installed and the user is signed in. We’ve confirmed this across multiple test devices.

Can the affected accounts receive notifications from other apps or bots in Teams?
Yes, affected accounts receive notifications from other apps and bots in Teams without issue.

Does the issue occur for all users on iOS or only certain accounts or devices?
The issue occurs for all users on iOS devices that we’ve tested. It does not appear to be account- or device-specific.

Does the problem persist after reinstalling the SL2 app and/or Teams app on iOS?
Yes, we’ve tested reinstalling both the SL2 app and the Teams app. The issue persists after reinstallation.

Have you tested on different iOS versions or device models to rule out device-specific issues?
Yes, we’ve tested across multiple iOS versions and device models, including iPhone 14 and iPhone 15 running iOS 26.0. The issue is consistent across devices.

If possible, could you please share a reproduction video for desktop, Android, and iOS, in case we need to raise a bug?

Also some of the issues that were shared show that this issue has existed since back in February of 2024. Is it true that there is no fix yet?

[hashem-ebrahimi]

When I try to load the video, I am getting Failed to upload.

[hashem-ebrahimi]

Hi team,

Thanks again for your detailed response and the 9 follow-up questions. I’ve provided answers to all of them three days ago and wanted to check in on the status of the issue. Could you please confirm if there’s any update or next step?

Looking forward to your reply.

[Nivedipa-MSFT]

@hashem-ebrahimi - Could you share a reproduction video for desktop, Android, and iOS, and send it to the mail alias microsoftteamsdev@microsoft.com? This will help if we need to raise a bug.

[hashem-ebrahimi]

As requested, I have sent the video showing Activity Notification for our SL2 for Teams application working on Android and desktop but not iOS. Please let me know if you have any additional questions.