Re: Roku TV will not connect to iPhone/iPad hotspot.
First off, what brand Roku TV, and what model iPhone? There are reports of problems with the iPhone X. I just tried connecting my Sharp Roku TV to my iPhone 6S and had no problems. Make sure your hotspot password only has letters and numbers, and there's no spaces in your phone name (although I have space and an apostrophe and it works fine).
Dan Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.