I had the same problem, tried: clearing starlink app cache and data, chrome cache and data, resetting password, shutting down and restarting phone, rebooting router - nothing helped. I then setup an older android on my wifi and was able to login fine with the older phone, the app also responded faster. I then checked the Android version of the phone that would not work, found it was Android 13. I upgraded phone to Android 14 and the star Link app then logged in and responded perfectly!
So check your Android app version, if it's 13 upgrade!