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Since this thread hasn't had activity in a while, we're going to close it to keep content fresh.
We hope you were able to get the help you need but if you're still having trouble, please make sure you are entering the right username and password for your Google Account. Reinstalling the Google Home app and resetting your password might also help.
If the issue persists, feel free to submit another post and provide as many details as possible so that others can lend a hand.
Hope this helps!