In this video, learn how you can disable a lost device or a device you no longer use in My Account. My Account is an online site that lets you manage your work or school account by letting you update your security information, change your password, manage your devices and guest organization accounts, and so much more.  

For more tips like this, check out the working remotely playlist at www.youtube.com/FoetronAcademy. 

Also, if you need any further assistance then you can raise a support ticket (https://cloud.foetron.com/) and get it addressed.