Function sign_multi_agent_transaction 

pub fn sign_multi_agent_transaction<A: Account>(
    multi_agent: &MultiAgentRawTransaction,
    sender: &A,
    secondary_signers: &[&dyn Account],
) -> AptosResult<SignedTransaction>

Signs a multi-agent transaction.

Errors

Returns an error if generating the signing message fails or if any signer fails to sign.