If you forgot your Yandex password, try resetting it manually. Just follow the instructions on the Restore Access page.
If you linked a phone number or email address to your account, we can send a confirmation code to your phone or inbox. To get a code, you need to enter the email address or phone number that you linked to your account (please note that you need to enter a complete phone number including country code). If you get a message that your email or phone number is incorrect, make sure that you didn't enter any typos. If everything is correct, try to remember if you might have linked any other phone numbers or email addresses to the account.
If you didn't link an email address or phone number to your account, then you will have to answer a security question to restore access. If you don't answer the question correctly the first time, see if an alternate spelling or other keyboard language works.