Guidance: VAT online: service availability and issues.
HMRC provides a dedicated webpage to report current availability and known technical issues affecting the VAT online service. This information is relevant to all VAT-registered businesses and agents who submit returns or manage VAT accounts online. Users should check this page if they experience difficulties accessing the service to see if there is a reported system outage or delay.
Source: https://www.gov.uk/government/publications/vat-online-service-availability-and-issues. Summarised automatically from the official source — general information, not advice.