Despite it previously working, I see a
Source not Supported error when attempting to Chromecast to a device. This also occasionally manifests itself as a device not showing up for Chromecasting.
The solution in my case was to set the
Load Media Router Component Extension setting to
- Open Chrome
- Navigate to chrome://flags/#media-router
- Search for
Router Componentor similar
- Set from
In my case, some organization-managed settings had changed defaults away from what they were previously.