Why does it prohibit adding a file via xls?

Question

Yandex.Direct

Hi all! Yandex gives an error Access to the interface for working with tabular format files is temporarily suspended.
Please try the following:
delete cookies;
clear the browser cache;
turn off incognito mode or add-ons that block cookies in your browser;
use the service in another browser.
If these recommendations did not help, please contact support via the feedback form.
what can be done about it? I did all the recommendations, and I made a new acc and the same error .. I did everything and even through a proxy, but it's useless.