Chromecast devices don't support these kind of Wifi systems, known as captive portals, that require you to login first and/or register the Chromecast MAC address to be able to access the internet.
In addition, Chromecast with Google TV uses a privacy enhancing feature called MAC address randomisation. This means it generates a unique MAC address for every Wifi network you connect to. Unfortunately, to turn this feature off you would need to be able to connect Chromecast to the Wifi network at least once in order to be able to get to the settings and turn that feature off, so you're in a catch 22 situation which means it's not possible to connect your Chromecast to that Wifi network.
There are a couple of possible solutions for this:
- Although unsupported by Google, you can try to use a phone or tablet as a Wifi hotspot. However, this will then use your mobile data plan, which could be expensive for you depending on the data plan you have with your carrier. Note you will need 2 devices to set this up.
- Turn on the Wifi hotspot feature on a phone or tablet. If you're not sure how to do this, refer to the manufacturer's support website.
- Connect a second phone or tablet to that Wifi hotspot.
- You can then use that second phone or tablet to setup your device and connect it to the Wifi hotspot on the first phone or tablet.
- If you're able to use a wired network connection instead, you could invest in your own cheap Wifi router, connect that router to the wired network provided and connect your devices to that router instead.
