Can't access settings on RE650 when used as access point
I am using my RE650 as an access point: ethernet cable from my router to RE650 and connect all my devices to RE650's wifi. Can't seem to access the settings through http://tplinkrepeater.net/. It just gives me the default page suggesting two solutions to connect. Tried downloading the TP-Link Tether iOS app, but it does not find any devices as it seems to be trying to connect to TP-Link_Extender, which doesn't exist. Also tried connecting the RE650 and laptop via ethernet, but nothing happens - still can't access the http://tplinkrepeater.net/ (page not found).
When trying to access 192.168.1.254, I get the login page of my actual router, not RE650, even though I'm connected to wifi through RE650. Wifi is disabled on my original router.
Tried macOS, Windows 10, iOS and Android devices - all give the same outcome.
How can I access RE650's settings while using it as an access point?