Turns out the issue IS NOT the connection to HMRC it is a mTD registration which has to be done before you connect. So just ticking the nTD without appying and receiving a confirmatory email is what the issue ue.
To resolve to to gov.uk/HMRC search for "VAT book keeping" and select sign up to MTD its the 4th or 5th down in the list and then follow the instructions, you'll receive an email in 3 days, then this error will go, as the authorisation is then made to you the cutomer.
Hi digitalgerry1, that's right, you'll need to register for MTD and wait for email confirmation of your registration from HMRC after completing this before connecting in QuickBooks - thanks for providing the link above for other customers in the same boat 👩💻
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