VK: Access denied: admin 2fa check fail

This error occurs when the mandatory login confirmation for managers is enabled in the group/page settings, but no login confirmation is configured for the VK user who connected the group/page to the service.

Open your VK page, then go to Manage - Followers:

If the "Enabled 2FA" checkbox is checked,you need to configure login confirmationfor the VK user who connected the group/pages to the service.

You can configure login confirmation in the"Security and login" VK section.