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Go to settings on your phone, change the date to March 5th, perform
setup again once completed switch you're phone back to correct date..
this should fix it
How to get Chromecast working again... go to settings on your phone and
set the date to March 5, next begin setup on Chromecast on the Google
home app... once setup has been completed set your phones date back to
today's date and your issue should be...