Usually it's the company's fault someone doesn't know about it because there's no one place to share information. It could be in Slack, email, wiki, Google Doc,

Usually it's the company's fault someone doesn't know about it because there's no one place to share information. It could be in Slack, email, wiki, Google Doc, checked into the github repo with the software, checked into some unrelated repo where some team decided to document code, I've even seen a team use an outsourced wiki host that only they had access to and they'd put documentation there. When you asked for the doc (assuming you knew that you had to ask for it), they'd print a page as PDF and send it to you. If they want to be hands-off and let teams put documentation where it works the best for that team, they should have a good search engine that will search across all those spaces.