I set up a neo account with my old ledger back then.

Now I want to send my Neo's to my new Ledger Nano X address, unfortunately I can't find any Neo app in Ledger's app catalog anymore.

Does anyone know this problem and has a solution to it?

According to Ledger (https://support.ledger.com/hc/en-us/articles/115005530425-Neo-N3-NEO-?support=true) there should be an app.