Unable to authenticate with HMRC error

While authenticating with HMRC or submit a VAT Return, the following message may appear: 

This can occur when:

• The company VAT registration number in Accounting isn't linked to the Government Gateway user ID you've authenticated with - To check the VAT registration number, go to More, then Business Settings and Accounting Dates & VAT
• The Government Gateway credentials weren't correct when you authenticated - To check this, go to the Government Gateway and ensure you can sign in using the same ID and password

 NOTE: If you've migrated from another Sage product, you'll need to connect to HMRC and not use the reauthenticate option.

If you have checked all of the information above and are still receiving the error, please contact HMRC (opens in new tab).