👋 Hey Reader, Welcome back to another episode of the TechSEO Vitals Newsletter! Recently I worked on a site using a language code that doesn’t exist. Not a typo in one template. One market’s code, invented, sitting in the head of every page on the site. One version stopped being an alternate and became a competitor. It got indexed alongside the others. Rankings flipped between them week to week. The client thought they had a content problem. They had a two-letter problem. ➡️ TL;DR An invalid...