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Did you try change the date on your phone to 7 March turn off auto
updates. Re set up Chromecast. Google will then pick up fix. Change date
back on your phone and put auto update back on. This worked for me
You need to change the date on your phone to before the 7th. Go to
Google home and re set up your Chromecast. It will pick up the new fix.
Change your date back