Unfortunately, the Web Reader bookmarklet doesn’t work on all websites. Some websites have security policies which prevent it from running. In this case you could try using the Readlang Web Reader Chrome extension for desktop Chrome instead.
Other cases in which the bookmarklet doesn’t work are:
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when new content appears with a website dynamically after the page has already loaded (e.g. subtitles on a YouTube video, new posts appearing in a social media feed)
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when the website contains an iframe (technical term for a website within a website), which is commonly used for the comments section on a blog post.