Xbox Live Windows 10 Teredo Forza Horizon?

I need some advice on setting up my Teredo on Windows 10. I do not get an open NAT-type connection to play online (Forza Horizon 4).

With my old FritzBox it worked with this PC, now I have a TP-Link router (TL-WR841N).

So far, I have already tried everything:

get Windows fixes in the Xbox network settings
Xbox website guide by prompting you to reset and enable all Teredo settings
Xbox website guide for setting up a static Teredo port
Accessed the router interface via the browser and set port triggers and virtual servers to all possible Xbox ports (see pictures)

DMZ enabled, DMZ disabled

What is the catch? Or is it something obvious? With my old Fritz box I had to take out only one hook with Teredo filter and it ran…

To buy a FritzBox is currently out of the question.

Many Thanks!

https://portforward.com/tp-link/tl-wr841n/ could help.

As you can see on the screenshots this is already activated. Further proposal?