fayest

I have exactly the same issue, The online helpdesk are unable to help as I cannot provide them with the information stored within my personal tax account in order to remove the authenticator app from the tax account as a method of receiving the verification code. Deadline is approaching and I have no way of submitting my self assessment as apparently my passport is not sufficient identification, I need to be able to provide the month & year I first registered for self assessment and the month and year of my last submission, both of which are pieces of information I only have stored in my personal tax account which I cannot gain access to. Calling the online helpdesk again is not going to help so what should I do? Incredibly frustrating.