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On 10th December the electronic certificate used to identify the Tax Agency and its suboffices' E-Office is changing.
El nuevo certificado se puede consultar en el siguiente enlace: https://www.agenciatributaria.gob.es/AEAT.sede/en_gb/Inicio/_otros_/Validacion_del_certificado_de_sede/Validacion_del_certificado_de_sede.shtml