Find out where shortened URLs lead to without clicking
http://usdos.sharepoint.com/_layouts/15/SignOut.aspx?isso=true&returnUri=https://postach.com.ua/gres-tile/&signoutoidc=1
https://usdos.sharepoint.com/_layouts/15/SignOut.aspx?isso=true&returnUri=https://postach.com.ua/gres-tile/&signoutoidc=1