We had a user receive the message below when attempting to retrieve the VAT periods as part of the Making Tax Digital process.

The full message reads “Not possible to retrieve VAT return periods. Reason from the HMRC server. The client and/or agent is not authorised”
You can retrieve the full message by going to “Service Connections” and selecting “HMRC VAT Setup” and clicking the option “Http log”

You then highlight the row in question and click “View Details”

When reviewing the log it shows the following complete error:

After investigation it appears the error suggests there has been an issue with the registration process for Making Tax Digital.
In this instance they contacted HMRC who confirmed their activation hadn’t been completed due to a backlog and to try again in a few days time.
Therefore this issue should be resolved as soon as HMRC complete the registration process for them.
Therefore if anyone else comes across this issue its best to check with HMRC to ensure everything is fine with the registration in the first instance.
I hope this helps anyone else who comes across this issue.
Thanks for reading.