See below screenshot.
App Store Connect is making this process next to impossible.
And I'm sure this has been said a thousand times before by other developers but this UI, even when it "works," provides absolutely no guidance for developers about what Apple expects. It does not render the strings in context or provide reasonable examples so developers understand what Apple is even asking for here. What should a good subscription group description be? It's completely unclear. If the point Apple is trying to drive home is that developers need to be clear with customers, then it should take some of its own advice and explain to developers what it actually wants here.