How many devices can I add to my Cookidoo® account? You can register up to five devices with your Cookidoo® account, e.g. three Cook-Keys® and two TM5 appliances. Related articles What languages are available for recipes on Cookidoo® and on my TM5? What if the reverse mode, scale, or modes goes on and off at random while cooking with the Thermomix®? Does this mean the Thermomix® is broken and needs to be replaced? Is the Cook-Key® available in Canada?