@Nhartje
Thanks for the post.
Have you tried performing a factory reset, and trying to activate the Roku device using an alternate wireless network, such as a mobile hotspot, to see if you are able to activate and finish setting up the Roku device? Then once the device has been setup, try switching back to your home wireless network.
Please keep us posted what you find out.
Thanks,
Danny
Danny R.
Roku Community Moderator