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Please provide as much information as possible. At least, this should include a description of your issue and steps to reproduce the problem. If possible please provide a summary of what steps or workarounds you have already tried, and any docs or articles you found (un)helpful.

---Problem you have encountered:
Users with Luxembourg-based phone numbers (+352) experience an error during the SMS MFA process after successfully authenticating with a username and password. The error message observed is: "OPERATION_NOT_ALLOWED : SMS unable to be sent until this region is enabled by the app developer."

This occurs even though the customer said that Identity Platform configuration ("smsRegionConfig": {}) indicates no restrictions on SMS regions. Testing with Luxembourg numbers, including setting them as testing numbers, does not resolve the issue. SMS MFA works as expected for users with phone numbers from other EU countries and the UK.

I have verified Logs Explorer the message found OPERATION_NOT_ALLOWED

What you expected to happen:
All users, including those with Luxembourg-based phone numbers (+352), should be able to receive SMS messages and complete the MFA process without encountering regional restriction errors. The Identity Platform configuration ("smsRegionConfig": {}) is intended to allow SMS delivery to all regions, ensuring a seamless MFA experience across all supported locations.

---Steps to reproduce:
cannot reproduce the issue due to limitation of access

---Other information (workarounds you have tried, documentation consulted, etc):
Blockers:
>https://screenshot.googleplex.com/9L4hmcf7fiaax9Q.png
**There's no Luxembourg in Metrics Explorer - Verified SMS
>https://screenshot.googleplex.com/BtxE8yVQy6XUUAj.png
**Automon doesn't seem to show any data Firebase Phone Auth
>http://go/firebear-pa-dashboard
We still don't have access to this Plx dashboard to check if there's an abnormally low send rate
>https://screenshot.googleplex.com/Azjdk8gmCfdordM.png
**Can't see the dropdown of list of regions on firebase > authentication > settings page
>https://screenshot.googleplex.com/8K8UaURryaeLvXj
**Trying to find smsRegionConfig, but failed to do so. It seems to be not visible on our end

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- Logs, Errors: [Paste the relevant stacktrace / error log.]
"OPERATION_NOT_ALLOWED : SMS unable to be sent until this region is enabled by the app developer."

- Internal / Public Playbooks: [Paste the relevant internal / public Playbooks followed by you and the customer.]
>https://g3doc.corp.google.com/company/teams/dps/Firebase/playbooks/auth.md?cl=head#regions_and_carriers_blocked
** Tried to to view GCIP and GTP but permission denied
>https://g3doc.corp.google.com/company/gfw/support/cloud/playbooks/firebase/authentication/sms-abuse.md?cl=head
**There is a statement there saying "Identifying a region as abusive is a developer side operation."
>https://g3doc.corp.google.com/company/teams/dps/Firebase/playbooks/auth.md?cl=head#sms-delivery
**Phone Authentication SMS Deliverability Issues

- Similar Bugs / Cases: [Paste any similar bugs / cases you found in SANS / MOMA]
>https://b.corp.google.com/issues/374269333
**Support: SMS Authentication requests issue for Hungarian phone numbers
>https://b.corp.google.com/issues/149377662
**Support: SMS not delivered for e-LUX Mobile
>https://b.corp.google.com/issues/369343690
**a recent issue on buganizer last Nov 13 2024