After a few hours of testing (& hair pulling), I was finally able to use an iPhone to view YouTube videos on a Wi-Fi connection without the dreaded buffering problem. For those who are also suffering from slow YouTube connections on your iPhones over Wi-Fi, here is a fix.
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As of yesterday, no YouTube videos could be played on my iPhone through the built-in YouTube App. As we recently modified settings on the router in our office, we thought it was something on our end. Sure enough, no router adjustment could resolve the issue. We continuously get the “This video could not be played” [...]