You could use your Magix Logon, go to My Products and check which devices are activated - it is very clear you can have two devices at any one time; one of the activations should correspond to the PC you are using. If it doesn't you will need to register it when the program opens.
If you have a second old device still activated, you can simply deactivate it. Each time you open Xara, it posts the activation date to your account.
In may case I don't use Pro X11, nor do I have it installed, so there there are no activations; by contrast I have Pro X18.5. and Pro X19 installed on two devices - when I use either one of them it posts the activation date back to my account against the device I have used.
If for some reason your installation behaves differently, you would need to raise a support ticket with Magix.
Gary
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