Firebase SMS authentication is delayed or sometimes not received - firebase

ISSUE
Firebase SMS authentication is delayed or sometimes not received
QUESTION
I want to know what would be the cause of such issue.
Tried to receive authentication to available phones and we receive the authentication.
Not all of the users experience the issue, but only for some.
Specific location: Adelaide, Glenelg South Australia
Date encountered: December 08, 2022

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Firebase phone auth sms not using app name from playstore

I've made an app with Flutter Firebase and released to Google playstore about 2 months ago and till today,the verification SMS sent to user's phone isn't picking up the app name from the playstore. The SMS received is given as example below
111111 is your verification code for myproject465.firebaseapp.com
Another user got responded by firebase support [here][1] stating that the %APP_NAME% will be automatically used after release(small delay may occur) but it's been more than a month and still not picking up the app name.
I've contacted firebase support but as I'm unable to opt in for a paid tech support, they can't help me further. Hope someone here can help me out
UPDATED: Enabling Safety net in the project fixed the issue for me( auth domain update not done)
[1]: https://stackoverflow.com/a/52525587/7610087

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