Users may encounter a Multi-Factor Authentication (MFA) issue where Twilio temporarily blocks a phone number. This typically happens when Twilio detects potential fraudulent activity associated with the number. The block is a security measure implemented by Twilio and does not indicate any intentional fraud by the user.
When this issue occurs, users will see the following error message during login:
Error! The destination phone number has been temporarily blocked by Twilio due to fraudulent activities. +630000000000 prefix is blocked for the SMS channel.
This block is automated but can be resolved by contacting support to unblock the impacted numbers.
How to resolve this issue
If you or your client encounter this error, follow these steps to resolve it:
- Identify all impacted phone numbers: Gather all the phone numbers that are experiencing the block.
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Submit the unblocking request form: Use the dedicated Zendesk form to report the issue and request unblocking.
- Link to the form: Twilio Unblocking Request Form
- Be sure to include all impacted phone numbers in the form submission to expedite resolution.
Support will work directly with Twilio to resolve the block as quickly as possible.
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