Problem: separate licenses needed for individual computers that dual-boot to Mac OS and Windows.
Having to purchase separate licenses for a single computer running as a dual-boot environment is highly problematic.
Only one licenses is used at a time!
Yes this is the expected behavior. Serial keys are different for Win and Mac and a single key won't work on both. I would recommend to switch to Subscription model where you can user a single subscription to work on both Win and Mac.