Due to changes made in newer Microsoft Windows Operating Systems, standard limited user accounts may not be able to log in from terminal.
open gpedit.msc on the target server.(must be administrator)
Computer Configuration > Windows Settings > Security Settings > Local Policies > User Rights Assignment
In the right-hand pane, locate the entry named "Allow Log on through Terminal Services "
double-click on it.
Add-User or Group
and add any account you desire to allow to login.