I was unable to change my windows server 2016 password through OSK. I was getting this below error:
To use the commands available when you press Ctrl + Alt + Del, click your user title and choose an option.
I spent so much time and later I found answer in microsoft.com.
This way helped me for Windows Server 2016 RDP session:
That's it. This worked for me.
Thanks to: https://answers.microsoft.com/en-us/windows/forum/all/user-tile/8faf8cb6-5a8c-43cf-abf6-00de00a80fe5