Even as recently as 2022 (when I used to work there), infra-as-code use at Microsoft was still very nascent and non-standard. Infra at Microsoft was mostly "ClickOps", with a ton of tribal undocumented knowledge about the right order to do things, changing the defaults, and things like that.

The amount of times we've had to reach out to an experienced person who had transferred to another team/org about processes in our team was ridiculous.