Thanks for the feature request! We have just started working on a feature to show the most recent device that a student has used (hopefully with a full log coming soon).
Product Manager for GoGuardian AdminMike Higgins commented
Yes, this would be a great service to implement. There is no good way to get at this information, Google Console has the devices and then the users who used them but not the other way, seems GG would be in a good position to gather and report on that info. Thanks!