Use this template for drop-in replacement from the jekyll-redirect-from style of creating redirect files from old routes to the route of the current page.
In the front matter or data of a page, add one or many redirects:
Single
redirect_from: /old-url/page
Multiple
redirect_from: [/old-url/page, /some-other-page]
The error was on our side, it still works great :) We had eleventy-redirect-from.njk in our eleventy ignores 🤷 😬
Sorry for the noise here :)