Filing with DSC IS cancelled

Users are encountering a 'DSC IS cancelled' error when attempting to file their GSTR3B for October 2020. The problem persists even when trying to re-register the DSC, as the system indicates the certificate is already registered with another authorised signatory. The suggested solution is to check the profile section of the GST portal to identify whose DSC is currently registered and to ensure the correct DSC is associated with the taxpayer.