When trying to Fetch Periods in VAT Filer in some cases you may receive an error message: '500 Internal Server Error'.
HMRC’s guidance on error codes advises that any 500 codes (500 to 599) is an issue from HMRCs server as per the below extract:
We use standard HTTP status codes to show whether an API request succeeded or not. They are usually in the range:
Therefore there is nothing that TaxCalc or any third party service provider can do to assist you with this error.
HMRC have advised:
Investigations found that this error is returned where the customer has not waited the recommended 72 hours for their record to be migrated to the MTD service. This means when they attempt to call an obligation there is no record for us to return.