How can economic operator register as a declarant and access the CBAM Transitional Registry?
When they intend to become reporting declarant for CBAM purposes, economic operators must contact the national competent authority (NCA) of the Member State where they are established. The provisional list of NCAs is published and continuously updated on the dedicated CBAM webpage of the Commission: Carbon Border Adjustment Mechanism (europa.eu).
In each Member State, the NCA is also responsible for providing reporting declarants with access to the CBAM Transitional Registry. In some cases, a new CBAM specific account with new login credentials will be required. In other cases, existing accounts for accessing custom systems may be used. In the case of Spain, for instance, access to the CBAM Transitional Registry is granted exclusively via the customs domain. Please contact your NCA for further details on the login credentials in your case.
Where the reporting declarant uses a “CBAM service provider”, it is possible to request from the NCA, in UUMDS, the creation of all user profiles (importers and “CBAM service providers”) at the same time. Once the user profiles are created in UUMDS, the importer- employer (EO) can delegate the CBAM declarant access to the provider-employee (EMPL).
Source: EC’s Questions and Answers on CBAM