https?://(www.)?youtube.com/watch?v=([a-zA-Z0-9_-]+).* Set Redirect To as: https://materialious.einfachzocken.eu/watch?v=$2 Choose Regular Expression and apply to Main Window. If the redirect works but the Invidious instance fails, try replacing materialious.einfachzocken.eu with another active instance, such as https://yewtu.be or https://vid.puffyan.us. Try: Standard watch URLs (https://youtube.com/watch?v=...) Embedded links (https://youtube.com/embed/...) Mobile links (https://m.youtube.com/...) If it still doesn’t work, test the configuration with different Invidious instances. The issue might be with the instance itself. Trial and error will help you.