Chromecast (2nd gen) and Audio cannot Cast in ‘Untrusted’ outage [U]

I was wondering why my Chromecast was suddenly untrusted. An update seems to have knocked off older Chromecast devices globally. People are factory-resetting them before they know what to do, making the potential fixes even harder. https://9to5google.com/2025/03/10/chromecast-2nd-gen-audio/