Ener j WiFi receiver and switch

<div class="bbWrapper">Morning,<br /> Having a little trouble with the above receiver and I am sure it is something really simple. <br /> Got an exsisiting 1g switch wired to the switch (live feed and switch line). I wanted to connect the WiFi receiver and switch to work like a two way. The receiver has the terminals live in/live out, neutral in /neutral out, s1 and s2.<br /> If I wire it by bypassing switch it works fine . The wiring diagram says I can use the s1 and s2 to wire in the existing switch it it does not work . <br /> If anyone has used these before or highlight the simple thing I missing it would be great<br /> <br /> <script class="js-extraPhrases" type="application/json"> { "lightbox_close": "Close", "lightbox_next": "Next", "lightbox_previous": "Previous", "lightbox_error": "The requested content cannot be loaded. Please try again later.", "lightbox_start_slideshow": "Start slideshow", "lightbox_stop_slideshow": "Stop slideshow", "lightbox_full_screen": "Full screen", "lightbox_thumbnails": "Thumbnails", "lightbox_download": "Download", "lightbox_share": "Share", "lightbox_zoom": "Zoom", "lightbox_new_window": "New window", "lightbox_toggle_sidebar": "Toggle sidebar" } </script> <div class="bbImageWrapper js-lbImage" title="IMG_2488.png" data-src="https://www.electriciansforums.net/attachments/img_2488-png.119468/" data-lb-sidebar-href="" data-lb-caption-extra-html="" data-single-image="1"> <img src="https://www.electriciansforums.net/attachments/img_2488-png.119468/" data-url="" class="bbImage" data-zoom-target="1" style="" alt="IMG_2488.png" title="IMG_2488.png" width="1206" height="2622" loading="lazy" /> </div></div>