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You need to set the time on your phone to March 8th before you can add
chromecast in the Home app. After that, keep chromecast on. Chromecast
will be updated to fix the problem and then it will work normally.
It seems like the same problem is happening all over the world right
now. It's probably a bug from the developers. There were a lot of
comments on YouTube last night that were having the same
problem.https://youtu.be/pTAnF6wwa4o?si=mWJTX81CzmP8mMHL