Go to https://x.com/i/flow/signup and press signup.

Enter some details, Name, email and dob.

Authentication check such as using the arrows, move the person to the indicated seat. (1 of 10).

The authentication check is too difficult even for humans.

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Sign up

Enter Name, email and dob

Then authenticate the email.

Agree the conditions.

They perform phone verificaitons, using the authenticator app.