This is one of the reasons that I haven't synced my PC with my MS account
Unfortunately, there's now a good reason to do so: one of the major Win10 updates changed Windows Activation to be married more tightly to the Microsoft account. You may only be able to reactivate Windows 10 after a major hardware change (motherboard, typically) if the computer has a linked ID. That multi-block hash or whatever, and the automated phone assistant who provides another one, are deprecated. If the digital ID is linked, Activation will offer a list of linked devices, let you select the one that has changed, and attempt to re-activate. Without that a permanent activation failure will occur, and you must call the Microsoft Answer Desk during business hours and hope the tech accepts your "not a pirate" explanation.
The techs are apparently trained to accept a motherboard failure/replacement as a legitimate reason provided the COA code doesn't show up with a fishy history, but that was 20 minutes of my life that I'm not getting back.