What is sign-up in One Tap used for on Android?

Question

I'm trying to implement One Tap sign-in and sign-up in my project. I have created a brand new emulator but I didn't sing in with a Google account. When I try to sign-up in my app, I was expecting to redirect me to a screen where I should provide my Google credentials, but I get an error saying:

Cannot find a matching credential.

So I need to first sign in in my emulator and then sign-up in my app? If so, then what is the sign-up good for?

Answer 1

I have a solution for this Please use web App Clint key