Sentinel + Autotask + Relay Missing required key 'FunctionName' in params

Sentinel + Autotask + Relay

async function main(signer) {
    const contract = new ethers.Contract(ADDRESS, ABI, signer);
    *return await contract.get_My_address();*
}

error:"Missing required key 'FunctionName' in params";

but wnen i use this:

exports.handler = async function(event) {
  const provider = new DefenderRelayProvider(event, { speed: 'fast' });
  const web3 = new Web3(provider);
  // Use web3 instance for querying or sending txs, for example...
  *const [from] = await web3.eth.getAccounts();*
  const contract = new web3.eth.Contract(ABI, ADDRESS, { from });
  await contract.methods.ping().send();
}

error:"Missing required key 'FunctionName' in params"

I don't know how to use Sentinel + Autotask + Relay to send a smart contract rpc methord.please help me.