60423: Multiple contacts were found

Twilio returns this error when Verify resolves more than one contact from the lookup criteria in your request. Verify cannot continue until your request identifies a single contact record.

• Your request uses lookup criteria that are too broad or ambiguous, so more than one contact matches.
• You stored duplicate or overlapping identifiers across contacts. unique_customer_provided_id values and channel values must be unique for each contact.
• You stored or submitted phone-based identifiers in an inconsistent format. Verify and the Contact API require phone numbers in E.164 format.

• Send one unambiguous identifier for the contact. If you fetch a contact, use either unique_customer_provided_id or channel, not both.
• Review your contact records and merge or remove duplicates. If the contact already exists, update the existing contact instead of creating another one.
• Normalize phone numbers to E.164 before you create contacts or start verifications, then retry the request.
• If you upsert contacts through the Contact API, use each item's correlation_id and response details to identify and correct problematic records before you retry.

• Verify
• Verifications API
• Contact API