I have managed to do this on our domain joined PCs but when i create a similar local policy for some other PCs the meessage doesnt appear.
The PCs have one user which is a member of the local administrators group.
I have used this as a guide to creating a similar local policy: http://prajwaldesai.com/how-to-configure-legal-notices-on-domain-computers-using-group-policy/
Which did nothing. Then I forced the user to press CTRL-ALT-DELETE using this guide - https://jimmah.com/vista/Administration/ctrl_alt_delete.aspx
Still no notice. I now have to press CTRL-ALT-DELETE. Then I get the usual user icon which when clicked, takes me straight in to the desktop - no notice.
What am I doing wrong?