There are several possible reasons for this error, and so there are several possible fixes. For example, it could be the browser experiencing a hiccup, an issue with the Chromecast itself or your network, or some other things, from incompatible software to disabled settings.
How to Fix Chromecast ‘Source Not Supported’ Error
Here’s what to do when you see this error in Chrome. These steps should work no matter what you’re trying to cast, whether it’s a streaming video, a local file, or the whole desktop or browser tab. Remember to test to see if the solution worked for you before moving on to the next step. Despite seeming too simple of a solution, a restart is the easiest first step to try and could be all that’s necessary to fix the error. If you have an Android TV, now is a good time to check for updates. Google provides instructions on performing Android TV updates.
Connect to Cast devices on all IP addressesCast Media Route Provider
VPNAd-blocking extensions or softwareFirewallAntivirus software
In there, first, try toggling the option off and then back on. If that doesn’t fix the error, return to this section to clear out the cache. Find the date and time option in your TV’s settings and set it to be determined automatically. Next, select the Use network time option (it might be called something similar). In fact, for some people, using Edge to connect to the Chromecast might, for whatever reason, trigger or wake up the connection from your computer to the Chromecast, thus fixing the error in Chrome. So, it’s worth a shot.
