The tweet needs to contain only your Solana address. For instance if your Solana address is FidaKmZFztWo5bx7EBwZ1Z7Wra7PeELXKxdoYEGAjodq, your tweet needs to contain only “FidaKmZFztWo5bx7EBwZ1Z7Wra7PeELXKxdoYEGAjodq” and not “something something FidaKmZFztWo5bx7EBwZ1Z7Wra7PeELXKxdoYEGAjodq something”. If the Tweet contains anything else than your Solana address the registration will fail.