For StudNet accounts with move-in date on the renting contract BEFORE February 2022 or in some shared apartments, you sometimes still need to set up an Internet login on the connected wifi router to establish the connection to the Internet after successful registration.
TP-Link wifi router ASUS wifi router
Most accounts with move-in date on the renting contract AFTER January 2022 do however use the IPoE system for which there is no need to configure a separate Internet login.
Information on which system is in use for your StudNet account can be found in the registration e-mail (Startup) or by login on https://netstat.stw-bonn.de.