Eero routers block the GameGlass domain by default, this prevents the Host software from installing or running and also breaks app functionality. To solve this issue, head into your Eero settings and add "gameglass.gg" as either an allowed domain for your entire network, or allowed on the devices needed.

See here for help locating these settings:
https://support.eero.com/hc/en-us/articles/360045634132-Block-Allow-Websites