Timeout on system lock does not detect macOS Fast User Switching

[dygordon]

Steps To Reproduce

1. Use a macOS device with 2 or more user accounts.
2. Login to one of the accounts (User A). Turn on show Fast User Switching - Show in Menu Bar or Show in Control Center in macOS System Settings | Control Center.
3. Configure Edge browser extension on macOS with Timeout = "On system lock" and Timeout action = "Lock"
4. Unlock Bitwarden browser extension.
5. Click the Fast User Switching icon
6. Select another user (User B). Login.
7. Logout as User B.
8. From the lock screen, select User A and login.
9. Note that User A's Bitwarden browser extension remains unlocked.

Expected Result

Treat a fast user switch or any return to lock screen as a system lock and lock the browser extension.

Actual Result

Bitwarden remains unlocked.

Screenshots or Videos

No response

Additional Context

Using the Lock Screen shortcut (Ctrl-Cmd-Q) or closing the laptop lid both lock the extension as expected.

Operating System

macOS

Operating System Version

15.6.1

Web Browser

Microsoft Edge

Browser Version

142.0.3595.94

Environment Versions

Version: 2025.11.1

SDK: 'main (8ef7951)'

Server version: 2025.11.1

Issue Tracking Info

• I understand that work is tracked outside of Github. A PR will be linked to this issue should one be opened to address it, but Bitwarden doesn't use fields like "assigned", "milestone", or "project" to track progress.

[bitwarden-bot]

Thank you for reporting this issue! We've added this to our internal tracking system.
ID: PM-29094
Link (for internal use): https://bitwarden.atlassian.net/browse/PM-29094

[Neonwarden]

Hi there,

Thank you for your report!

I have flagged this for our engineering team.

If you wish to add any further information/screenshots/recordings, etc., please feel free to do so at any time - our engineering team will be happy to review these.

Thanks once again!