etherscanApi config - relayer config

In my relayer config, I set these configs but when I sending the transaction I see this error auditTransaction response: {"message":"Etherscan API URL is not set on this server!

Is this config correct for rinkeby?

{
   "etherscanApiUrl": "https://api-rinkeby.etherscan.io/api",
   "etherscanApiKey": "string"
}