Cannot access msftconnecttest after firmware update

Hey there,

today I updated the firmware of my WiFi Repeater. After the Update, I could not access msftconnecttest.com anymore. I get a 404 with this message:

404 page not found

(thats also the only content of the source code of this 404 page)

The weird thing is, this persists even after a factory reset. I can set the repeater up and connect it to my WiFi - it also works - right now I am connected to my WiFi via the repeater. But as soon as the setup process is done, all I get on msftconnecttest is this 404 page. (also in incognito mode).

Another problem is: I cannot use the repater as access point anymore. I don't know if this is part of the same problem since I also got a new router which might be the problem here.

Thank you for tips.