If you’re filing the return from January to march, you can use the old way of filing. You can then use the new way moving forward.
Here’s how to file the old way:

  1. In QuickBooks, Go to File VAT. 
  2. Select File VAT instead of File VAT MTD. 
  3. By pass the HMRC […]

Resolution for 'Additional Resources issue: 'Quickbooks Pro 2019. VAT MTA Filing failing with Please check the VAT Registration Number and try login again. Done that 4 times still not working. Suggestions welcome.' available: Yes.

The Additional Resources issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the Additional Resources issue yourself by looking for a resolution described in the article. If it is a complex Additional Resources issue or you are unable to solve the issue, you may contact us by clicking here or by using other Additional Resources support options.

For more information about resolving issues related to Additional Resources in Quickbooks/QBO or to get support for the issue 'Quickbooks Pro 2019. VAT MTA Filing failing with Please check the VAT Registration Number and try login again. Done that 4 times still not working. Suggestions welcome.', click the link below: