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When you first sign in, Nuj gives you a six-character invite code. Share it however you like — Messages, WhatsApp, in person. Your partner opens Nuj, taps "Join with a code", and types it in. The wall opens the moment they're in.
Your code lives in Settings → Invite until your partner joins.
On the sign-in screen tap "Join with a code" and enter the six characters your partner sent.
If the code looks right but isn't accepted: