again, thank you for the advice/comments/suggestion and explanations.
Admin2 suggested that if there is no P60 question, this would indicate that the tax office does not hold information to check against.
I tried to use the HMRC webchat where an adviser have suggested:
"if you still are not getting the p60 option
you will need to reply to any email they
have sent you to advise that option is
still not available"
I also asked the Technical support with HMRC online services and received quite complex reply covering all the possible reasons and scenarios for having problems with the Identity verification - please read the whole reply below in case some of you will find the right solution there - I did not :(
I only wonder why the tax office might not hold information to check agains if I have an official P60 ... this is perhaps another step to take (if an adviser will someone available any soon)
Thank you for contacting Digital Customer Support Team.
To check your records, manage your details and send forms online to HMRC, you must verify your identity. Not everybody will be able to verify immediately as the verification service is in development and limited to questions about pay and tax from employment, passport information and UK credit reference data.
Punctuation marks: The website is designed to ensure all usable punctuation marks are accepted. Your device may not be making the relevant punctuation marks (e.g. decimal point) available for you to use. Please consider using a different device such as a computer.
Credit record: If you are asked to provide a UK address to verify using credit reference data and you don’t have a UK address or credit history, you will not be able to check your records, manage your details and send forms online to HMRC but you can use webchat, phone and postal services, contact the relevant helpline for details. (https://www.gov.uk/contact-hmrc)
Payslips: If you are asked to enter the details from any one of your last 3 payslips you cannot use a payslip which has zero or a refund (negative) amount, please choose one with a positive amount.
P60: If you are asked questions about your P60 and you cannot find it, contact your employer or pension provider for a copy. If you have more than one P60, choose one which shows that you have paid National Insurance and use that to answer the questions. If you had more than one job in 18/19 year, please enter the pay figure shown in the box titled, "In this employment".
Tax Credit: If you are asked questions about your tax credit payments or the account the tax credit payments went in to, you can find that information on your bank statements.
Passport: If you are using a UK passport to verify, you must enter the date it expires in the correct format, for example 19 September 2025 should be typed as 19 SEP 2025. Your name must be typed exactly as it is shown on the passport. You can try another way to verify by answering that you don’t have a passport.
If you are trying to access the Inheritance Tax Service, you may need to use the downloadable Inheritance Tax IHT205 form instead. To use the IHT205 form the estate needs to be an excepted estate - you can check whether it is accepted at, https://www.tax.service.gov.uk/inheritance-tax/domicile.The form is listed second on the IHT205 page on GOV.UK
If your circumstances do not meet the current verification criteria, you will not be able to use online services.
Please be aware that you can still use webchat, phone and postal services to check your records, manage your details and send forms to HMRC, contact the relevant helpline for details. (https://www.gov.uk/contact-hmrc)
If this advice has not solved your technical issue, please respond to this email and send a screenshot of the details you have entered.
Digital Customer Support Team