The links below are to articles reporting on Microsoft dropping support for ePub files/ebooks within the Edge browser.

For more visit:
– https://goodereader.com/blog/e-book-news/microsoft-disables-epub-support-for-the-edge-browser
– https://the-digital-reader.com/2019/08/28/microsoft-removes-feature-no-one-used-from-browser-no-one-was-using/
– https://blog.the-ebook-reader.com/2019/08/26/microsoft-dropping-epub-support-on-edge-web-browser/