UK VAT Submit VAT Return error message "Tax Period not found on HMRC side"

Thanks for your reply!
let me check these steps with user if information is correct or not.

And I would like to clarify the question - 

1. the External Applications Screen shows as bellow, it seem the account is expired right?
   so I would ask user to resign in to check the HMRC account status by click “Sign in”.

   

2. 2. The Tax ID is set on Companies is field “Tax Registration ID”

Thanks for your helpful support!

Nave a nice Day,

Hello @davidlee5,

1. Yes the date showing indicated its expired.
2. Yes the “Tax Registration ID” field

Kind Regards,

Amaan