I am encountering an error while trying to send an OTP using Firebase Authentication in my React Native app. The error message I receive is:

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ERROR Error sending OTP: [Error: [auth/missing-client-identifier] This request is missing a valid app identifier, meaning that Play Integrity checks, and reCAPTCHA checks were unsuccessful. Please try again, or check the logcat for more details.]
I have already ensured that my SHA1 and SHA256 fingerprints are correctly configured in the Firebase console, and the Play Integrity API is enabled. Despite these configurations, the error persists. Here are the steps I have taken so far:

Added SHA1 and SHA256 fingerprints to the Firebase console under my project settings.
Enabled the Play Integrity API in the Google Cloud Console.
Ensured my google-services.json file is up to date and placed in the correct location in my project.

What could be causing the [auth/missing-client-identifier] error despite having the correct SHA1/SHA256 fingerprints and Play Integrity API enabled?
Are there any additional steps or configurations that I might be missing?
Is there a way to further debug this issue to get more detailed information about the root cause?