@Sami Tiainen, Thanks for posting in Q&A.
If you want to assign ring policies only to new devices and exclude old devices, the official documentation recommends assigning policies only to device groups rather than a mix of device and user groups, as this can cause conflicts.
You can create two groups, one containing new devices and one containing old devices, and when you assign the policy, you can include the new devices and exclude the old ones so that users can perform driver updates without logging in to the device.
Hope above information can be helpful.
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