claude-code - 💡(How to fix) Fix [BUG] Phone number verification failed [1 participants]

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anthropics/claude-code#47171Fetched 2026-04-13 05:39:33
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Error Message

Error Messages/Logs

Root Cause

When activating the Claude account, a user could not verify the phone number because she did not receive any text messages Phone number: +84 979921423 (country: Vietnam, country code: +84)

Code Example

Too many verification attempts. Wait and try again later.
RAW_BUFFERClick to expand / collapse

Preflight Checklist

  • I have searched existing issues and this hasn't been reported yet
  • This is a single bug report (please file separate reports for different bugs)
  • I am using the latest version of Claude Code

What's Wrong?

When activating the Claude account, a user could not verify the phone number because she did not receive any text messages Phone number: +84 979921423 (country: Vietnam, country code: +84)

<img width="1096" height="624" alt="Image" src="https://github.com/user-attachments/assets/b373c421-6649-4fcc-9023-87f807ff2d20" />

What Should Happen?

Receive the verification code via a text message

Error Messages/Logs

Too many verification attempts. Wait and try again later.

Steps to Reproduce

  1. Click on Accept invitation from email
  2. Enter the phone number, region = Vietname, phone number = 979921423
  3. Click Send verification code
  4. No text messages received
  5. Try to verify phone number several times

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

No response

Claude Code Version

web app, the newest version

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Terminal.app (macOS)

Additional Information

No response

extent analysis

TL;DR

The user may need to check the phone number format and the SMS delivery settings for the Anthropic API to resolve the issue with not receiving verification text messages.

Guidance

  • Verify that the phone number is in the correct format, including the country code, as the provided phone number seems to be missing the leading zero after the country code (+84).
  • Check the Anthropic API settings for SMS delivery to ensure that the service is enabled and configured correctly for the Vietnam region.
  • Review the error message "Too many verification attempts" and consider implementing a delay between attempts or checking if there's a limit on the number of attempts allowed by the API.
  • Investigate if there are any regional restrictions or requirements for SMS delivery in Vietnam that may be causing the issue.

Example

No code snippet is provided as it's not clearly supported by the issue.

Notes

The issue may be related to the phone number format, API settings, or regional restrictions. Further investigation is needed to determine the root cause.

Recommendation

Apply workaround: Check the phone number format and API settings to ensure correct configuration for SMS delivery in the Vietnam region. This is recommended as it's a non-invasive step that can help identify or resolve the issue without requiring significant changes.

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