To me, the more amazing thing is that the product is Windows Server 2016 and the bug is because Microsoft is still supporting it nearlyrly 10 years later.
"The issue is under investigation, and additional information will be shared as soon as it becomes available,"
But somehow they know it is only 15 character names that are a problem. Did they just try every possible length?
How does a hostname length related bug like this get introduced? I'm not a Windows user, I've written exactly one .Net program. 15 characters sounds like a 16-character long buffer, ASCII-Nul terminated problem. 16 characters isn't that long.