[Messaging] Fix subscription not completing sometimes

[a-maurice]

Description

Provide details of the change, and generalize the change in the PR title above.

If the messaging token is received via Installations, which can happen if it is cached, it wasn't setting the flags to allow subscriptions to work correctly, causing them to hang. Set the flags, and resolve any pending subscriptions when the token is received via that mechanic.

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Testing

Describe how you've tested these changes. Link any manually triggered Integration tests or CPP binary SDK Packaging Github Action workflows, if applicable.

Running locally.

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Type of Change

Place an x the applicable box:

• Bug fix. Add the issue # below if applicable.
• New feature. A non-breaking change which adds functionality.
• Other, such as a build process or documentation change.

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Notes

• Bug fixes and feature changes require an update to the Release Notes section of release_build_files/readme.md.
• Read the contribution guidelines CONTRIBUTING.md.
• Changes to the public API require an internal API review. If you'd like to help us make Firebase APIs better, please propose your change in a feature request so that we can discuss it together.

[github-actions]

✅  Integration test succeeded!

Requested by @a-maurice on commit a06d206
Last updated: Thu May 29 12:57 PDT 2025
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