| Error code | Cause | Resolution |
| 422-117-11 | We can't authorise your client because HMRC revoked the token or the client is no longer enrolled in MTD. | Reconnect your MTD authorisation and confirm that HMRC has enrolled your client. |
| 422-117-12 | HMRC returned a server error (500). | Wait a few minutes, then submit your Income Tax quarterly update again. |
| 422-117-14 | HMRC accepted your submission, but we can't return the tax calculation. | Your submission is successful. We're working with HMRC to restore the tax calculation view. |
| 422-117-42 | HMRC already holds a submission with either a later date or a submission made through another provider or channel. | Submit your Income Tax quarterly update again using the current date. |
| 422-117-43 or 422-117-46 | The obligation dates from HMRC aren't correct. | There's a known issue where the quarterly update dates HMRC holds don't match your standard or quarterly update period type. You'll need to check your update settings and submit again. |
| 422-117-48 | The software contains a bug. | This is a bug we have now resolved, and you can submit your Income Tax quarterly update again. |
| 422-117-49 | HMRC has a bug with the income source. | Wait a week from the date of the error, then submit your Income Tax quarterly update again. |
| 422-0-1 or 408 | There have been too many submission attempts in a short period of time. | Wait a few minutes, then submit your Income Tax quarterly update again. |