Thank you and sorry for the late answer.
Yes, the reason on Yandex.Disk side, but they don’t want to agree with it. And unfortunetaly WebDav in Yandex.Disk - in not official feature, only for marketing, I think.
I can’t use local repository on that site because free memory is too small. But thank you.
So I decided to use OneDrive for business, but got another problem (((: Errors backing up to OneDrive for Business