Tineye is a reverse image search service .. SearXNG engine only supports ‘searching by URL’ and it does not use the official API

Tineye is disabled by default since it response is very slow (timoute set to 9sec). You can activate the engine in the preferences, but I would recommend to use the search-syntax and select the engine with its shortcut !tin .. by example if you have a URL of an image like

• https://static.vecteezy.com/system/resources/previews/003/759/921/original/alarm-clock-cartoon-isolated-free-vector.jpg

you can start a reverse search by:

• !tin https://static.vecteezy.com/system/resources/previews/003/759/921/original/alarm-clock-cartoon-isolated-free-vector.jpg

Next time please do not open a bug report for a question you have / I moved your ticket into the Q&A discussion.