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Resync keys

In certain conditions, your copy of the keys that another user uses to sign their messages and encrypt certain content in a chat with you can become out of sync. This can prevent you from starting new chats with the user or cause messages from that user to be marked as unverified (The lock icon).
You or the other user can use the “Resync Keys” menu to force key synchronization immediately. You can also use the Share Passphrase menu option to force a manual key exchange.
  1. In a chat, tap The options icon >
    Resync Keys
    .