[Bug]: MessageBar not announcing messages

[zoeschmitt]

Component

MessageBar

Package version

9.61.6

React version

18.3.1

Environment

System:
    OS: Linux 5.0 undefined
    CPU: (8) x64 Intel(R) Core(TM) i9-9880H CPU @ 2.30GHz
    Memory: 0 Bytes / 0 Bytes
    Shell: 1.0 - /bin/jsh
  npmPackages:
    @fluentui/react-components: ^9.0.0 => 9.61.6 
    @fluentui/react-icons: latest => 2.0.294 
    @types/react: ^17 => 17.0.85 
    @types/react-dom: ^17 => 17.0.26 
    react: ^18 => 18.3.1 
    react-dom: ^18 => 18.3.1

Current Behavior

When intent=error or politeness=polite/assertive the messages are not being read out by VoiceOver/Narrator.

Expected Behavior

MessageBar should be announcing messages to screen readers when intent=error or politeness=polite/assertive.

Reproduction

https://stackblitz.com/edit/yqxhweep?file=package-lock.json

Steps to reproduce

1. Turn on your screen reader.
2. Click "Add message".
3. Observe no message being announced.

Are you reporting an Accessibility issue?

yes

Suggested severity

Urgent - No workaround and Products/sites are affected

Products/sites affected

BizChat

Are you willing to submit a PR to fix?

no

Validations

• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• The provided reproduction is a minimal reproducible example of the bug.