Using Firebase with expo

I was following the link Using Firebase - Expo Documentation but when I run my app I always get the following error:
Your API key is invalid, please check you have copied it correctly."}code: "auth/invalid-api-key"message: “Your API key is invalid, please check you have copied it correctly.”

Not found any solution on any blogs or StackOverflow. Can someone help what could be wrong here.?

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