When you call the Yandex.Direct customer service department, you will be asked to provide the campaign number and a one-time PIN. It is valid for 15 minutes and is required for each new call. This is necessary for data security: only you can grant access to your campaigns to a specialist and only for the duration of the call.
In the upper-right corner of the page, click your login.
At the bottom of the window click , then Generate PIN code.