That means it is tied to your login, something is set in your preferences so that you aren’t seeing content.
Picking “undetermined” isn’t the same as having never touched it. There is a steady stream of people who accidentally touch the language settings and say they don’t see anything.
Sorry I can’t be specific on how to click and what works, I just know you aren’t the first to get their account where it stops showing routine content.
Lemmylefty