igpapi — Instagram private API Simulator for Node.js (API reference) 4.14.0
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    Variable RegistrationUsernameScreenConst

    RegistrationUsernameScreen: RegistrationUsernameDefinition = ...

    com.bloks.www.bloks.caa.reg.username, "Create a username" — as the fresh-install Android 429 app sends it.

    The accepted-name answer pushes it, so its enter sends nothing. The person types the username they want; submitUsername sends username.async and moves to the terms screen. A taken or invalid username is the typed RegistrationUsernameTakenError and the screen stays on top. The action also requests the attestation nonces the account creation reports: the Play Integrity nonce before the submission and the keystore nonce after it, the app's order.

    No screenshot: the frame needs a registration that reached this step.

    Unverified on Android 451: this screen is modelled on 429 only. What closes it is an Android 451 app registering a new account from the login homepage.