Please note that on the 23 November 2020, is the last day for signing up to the TSS (Trader Support Service) to ensure an automatic allocation of an XI EORI number, even if you are not using the TSS to do your NI declarations.
If you do not sign up latest this date you may have to make a separate application for an XI EORI number. For further information about EORI numbers please visit www.gov.uk/eori.