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In order to use Creative cloud on a third device , you will have to purchase a new subscription with a different email id .
For plans refer ::Creative Cloud pricing and membership plans | Adobe Creative Cloud
For more information , you may also refer :
Hope this helps !!!
How often do you need to use the third device?
If occasionally then you can toggle activation on one of your other two devices and use it on the third device when required.
If you need regular use then you'll have to subscribe separately with a new Adobe ID,
Not that much how do I toggle it