Why is my Xbox Series x not reaching 1000 MB / SEK?

Ea
- in Xbox
1

My tariff can be up to 2300 Mbit per second. But the Xbox doesn't. How so

Ho

Are the corresponding ports open on the router?

The best guide I've found is this one:
https://www.xboxdynasty.de/news/xbox-series-x/so-richtet-ihr-euer-netzwerk-optimal-ein/

Is the NAT setting set to "open" under "Network" in the Xbox system settings? Or does it say "moderate" or "strict"?