19042: Custom Field validation error

The request contains one or more invalid values for a Flex custom field. This error occurs when the custom field payload does not meet the expected validation rules for type, format, or allowed length.

• A custom field value exceeds the maximum allowed length.
• A custom field value uses the wrong data type, such as sending text where a number, boolean, or date is expected.
• A date value is not in the expected format.
• A required custom field value is missing from the request.
• The request includes a value that does not match the validation rules configured for that custom field.

• Review the request body and confirm that every custom field uses a valid value for its configured type.
• Verify that string values do not exceed the allowed length for the field.
• Check that date values use the format your Flex configuration expects.
• Remove unsupported or malformed values from the request before sending it to Twilio.
• Compare your request with the Flex API resource you are updating or creating and correct any field-level validation issues.

• Flex documentation