So I Googled this to see what they were shown...
https://answers.microsoft.com/en-us/windows/forum/all/my-pro...
A notification in the status bar, along with their other 10+ notifications about Skype, printers, antivirus etc. They didn't see it, or if they did see it, didn't understand the implications. The horrible thing is that they didn't want to bother me with it, and tried to solve the issue themselves :(