I am having the exact same issue and also live in a rural area where high-speed internet from major carriers is unavailable. Thus, I rely heavily on my hotspot. I can’t even revert to iOS 14 because I just received a “new” iPhone X from Apple (my previous one was defective) which came pre-installed with iOS 15. My Roku TV worked beautifully when connected to my hotspot on iOS 14. It now technically connects, but nothing will load on my Roku TV once connected. This is an incredibly frustrating issue.
seekthyself
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