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Making Tax Digital NAV 2016 - The client and/or agent is not authorised.

I have been through the motions creating a test appliction on the HMRC developer portal in order to test updates applied to NAV 2016. I have managed to generate an authentication token successfully in my environment however, every time I try to do anything such as submit a vat return or retrieve vat liabilities I get the error message:

The client and/or agent is not authorised.

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