Hello, I cannot complete WhatsApp Cloud API phone number registration for a new production number. Clicking "Register" and entering the 2-step verification PIN returns a generic "Registration failed. Please try again." error.

Via network inspection I captured the actual internal GraphQL error on mutation register_devx_phone_number: - code: 1675030 - message: "A server error field_exception occured. Check server logs for details." - severity: CRITICAL - is_transient: false - allow_user_retry: false - mids: a0ce9c12eae410e6f3cec58b3819bfd2 (identical on every attempt) - fbtrace_id: HJDoDFsygqv, Bbp3OiJCDpo (different attempts, same mids)

Already ruled out on my side: - System User has Full access to this WABA - A valid payment method is on file (no billing alerts) - Business is verified (Security Center confirms "Your business is verified") - 2-step verification PIN is entered correctly (6/6 digits accepted) - Number profile is fully populated (category, description)

The error is 100% reproducible across multiple attempts, always the same code and internal mids, only fbtrace_id changes. Since Meta's own response says allow_user_retry:false and is_transient:false, this looks like a genuine server-side bug rather than a fixable configuration issue.

I also tried the Report a bug tool (Support > Troubleshoot a bug > WhatsApp Business API), but the "Next" button stays permanently disabled for every WhatsApp Business API sub-category (Onboarding, Two-Step Verification, etc.), so I could not submit a bug report that way either. I see another post in this forum describing the same disabled Next button issue.

Account details: - Business ID: 1858011308516833 - App ID: 2542388486229889 - WABA ID: 1100577829099556 - Phone Number ID: 1227854440420316

Could someone from Meta please take a look at the server-side error for this phone number registration? Thank you.