Lost Gateway User ID connected VAT account

I have lost gateway user id connected VAT account and I dont remember which e mail I used for it. When I call Hmrc Vat service they ask for e mail address at last. How can I get back my ID and connect Vat account. System aslo block me to create a new VAT account with a new user ID.

When you call the IT VAT Helpdesk they will ask more than one security question in order to identify who you are and that you are a genuine person who is the owner of the VAT registered business. So it you called HMRC and they only asked one question, that doesn't sound like the normal procedure. There is no other way to reset a gateway password other than to call HMRC and pass the security tests, the security questions are more than just an email address, a genuine business owner should know details about their business such as when it was incorporated, it's business address, it's date of registration, it's last VAT return period that was filed, etc. You cannot create a new gateway, your VAT number can only be attached to ONE gateway, you already have a gateway, it would be chaos if you were able to have multiple gateways all using the same VAT number (open to fraud). Ensure you are calling the correct helpline (IT helpdesk, not the general VAT helpline) and I reiterate that you cannot reset your gateway without calling HMRC and going through the security checks. - https://www.gov.uk/government/organisations/hm-revenue-customs/contact/online-services-helpdesk