# 30758: Unknown Error Code

Log Type: APPLICATION

Log Level: ERROR

## Description

Registration Authority was not provided for brand registration to complete. Update the connected A2P 10DLC business data so `business_registration_identifier` is set to a supported value such as `EIN` or `DUNS`, and use `EIN` for US entities or international tax IDs.

### Possible causes

* The business profile used for A2P 10DLC registration is missing `business_registration_identifier`. Twilio uses this field to capture the business registration authority.
* The registration authority was set to a value that isn't supported for the business or registration type. Supported values include `EIN` and `DUNS`, along with country-specific identifiers for other regions.
* The matching `business_registration_number` was not supplied, or its format does not match the selected registration authority.

### Possible solutions

* Set `business_registration_identifier` to the correct authority for the business. Use `EIN` for US entities or international tax IDs.
* Enter the matching `business_registration_number` in the correct format. Use EIN format for `EIN` and DUNS format for `DUNS`.
* Review the business information in Trust Hub, then resubmit the brand registration after the profile contains complete and valid data.

#### Additional resources

* [Troubleshooting A2P 10DLC Registrations](/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands)
* [Gather the Required Business Information](/docs/messaging/compliance/a2p-10dlc/collect-business-info)
* [BrandRegistrations resource](/docs/messaging/api/brand-registration-resource)