You can test if the problem is the roku by taking it somewhere with wifi and testing it there. If it sees the networks, then I'd think your hotspot may be to blame.
@lnw5087 Thanks for reaching out. Based on the issue you described, it sounds like your wireless router may not be configured to broadcast a 2.4GHz wireless network. Roku Express, Roku SE, Roku HD, and Roku Premiere/+ (3920/3921) devices are only compatible with 2.4GHz wireless b/g/n networks. If you don't 'see' your wireless network when trying to connect, this is usually a good indication that your router may only be configured to broadcast a 5GHz wireless network. You'll need to contact your ISP or wireless router manufacturer and request that they assist you with changing your router's settings to ensure it is broadcasting a 2.4GHz network. Once they help you make this change, you should be able to get connected.
Hope that helps get things back on track!
Cheers,
Tanner