I can't create events
If you have received an error message, it means that Yandex's security system believes your account is suspicious. Possible reasons are that there is no phone number linked to your account in Yandex.Passport, or that your full name is fictitious.
As such you will be temporarily blocked from creating events in Yandex.Calendar. To resolve this issue, please provide accurate information on your Yandex.Passport page and link your main phone number on the Phone numbers page and the block on your account will be automatically lifted.