Your Wi-Fi network may be full, which is one of the potential causes of YouTube not working on Wi-Fi. This indicates an overabundance of devices on your Wi-Fi network, which could slow down everyone's connection. You can attempt to fix this issue by joining another Wi-Fi network or by using your cellular data in its place. Your Wi-Fi router could also be out-of-date as a contributing factor. Your Wi-Fi router might not be able to handle the demands of streaming videos if it is an older model. By upgrading to a newer model of router or updating the firmware, can fix this issue. A problem with your internet service provider is a third reason that could be the cause. Your Wi-Fi connection may suffer if your internet service provider is having issues. You can try to fix this issue by getting in touch with your ISP and seeing if there are any outages in your neighborhood. Your YouTube app might be out of date, which is the fourth potential explanation. The YouTube app may not work with your Wi-Fi network if you're using an old version of it. By updating the app to the most recent version, you can try to fix this issue. Your device might be preventing access to YouTube as a fifth explanation. It's possible that YouTube is being blocked by any firewall or antivirus software you may have installed. By turning off these programs, you can try to fix the issue and see if it helps.