Proxies get blocked often. If one doesn't work, look for "YouTube unblocked proxies" on a search engine. Always look for proxies that support HTML5 video and SSL encryption (HTTPS), otherwise videos won't play.
Sometimes the "block" is just a setting on your account rather than a network restriction.
Before we dive into the solutions, it's essential to understand the reasons behind YouTube blocks. Here are some common scenarios:
Avoid signing into your Google account on proxy or mirror sites.