Hey... I have also experienced the same issue. Here is copy of my summary to Microsoft:
Surface Book 2 screen cracked (for NO reason I was able to ascertain - not dropped or physically impacted in any way) - crack visible close to hinge on left side. Screen now has no picture/ no functionality however after hooking up device to a monitor/tv
with an HDMI adapter I can confirm that all other aspects of the Surface Book 2 are functioning normally and the issue/problem is limited to the cracked screen.
It is out of warranty and going to cost approx $700 USD...
Sadly I have no good news or options. Seems there are many folks experiencing this issue - and MS offer no help or explanation. To add insult to injury, I have now spent over an hour repeatedly trying to complete a repair request on MS website. After
several stages, just before final page and completing the order, website crashes and returns to start.
Microsoft have closed all their stores following Covid and it took ages to find the contact telephone number listed here for MS support... At this point, candidly not optimistic it will even work but please wish me luck....
Seems even when one is reconciled to paying for the (spontaneously) damaged screen, fun has just begun... This has been a horrible (and apparently far from unique or unusual) experience on an otherwise good product.