You have indicated that you earn over 50k per year.

To qualify for marriage allowance payments, one of you needs to have been a non tax payer for at least 1 year in the last 4 years.

One of you also needs to have been paying tax and earning between 12 and 50k per year. 

To correct errors or mistakes you can retake the eligibility test, however note providing false information will not increase your chances of qualifying as all information will be verified.