This will be an ongoing theme if you get into Computer Technology. A group of technology experts will agree on an approach and make a standard. Then Microsoft will say "We are big enough to ignore your rules" and make their own standard

RRAS – Routing and Remote Access Server and

MS-CHAP – Microsoft Version of CHAP

Are 2 cases of this

Microsoft is not a Technology company, they are a Marketing Company

Microsoft And Their Inability To Play With Others