I'm having the exact same issue except my roku TV won't even ask for a password it just tries to connect like it's an unsecure network even though it is secure, and I need to enter in a username and password. My school also has guest wifi meant for visiting prospective students that only lasts 24 hours. When I attempted to log into that one it did bring up the dorm/hotel wifi pop up, but once again that network is temporary. My school also has an unsecure network, but that means I can't connect my phone to my TV because its unsecured.
Is there a way to get the dorm/hotel pop up to work for the right wifi network? I think part of the problem is that the network doesn't redirect to another site, your just supposed to enter the username and password into the settings. Every other device I have had to connect to it has automatically brought up the username and password boxes, but roku won't, and if I manually enter the network in, I can ONLY enter in a password.
