error when signing a transaction object 'getDefaultChain'

[lubitelPenogo]

I have this code that sends a request to the server and receives a transaction from it

    const getTx = async (address: string) => {
        let tx = null
        const responce = await axios.post('http://localhost:5005/getTx', {
            address: address
        },
        {
            headers: {
                'Content-Type': 'application/json'
            }
        }

        );

        if (responce.data["error"]) {
            console.log('error: ', responce.data)
        } else {
            tx = responce.data
            console.log('tx: ', responce.data)
            
            try {

                if (provider) {
                    try {

                        const signedTx = await provider.request({
                            method: 'eth_signTransaction',
                            params: [tx]
                        })
                        console.log('sign: ', signedTx)
                    } catch (e) {
                        console.log('error signTx method: ', e)
                    }

                } else {
                    console.log("no provider")
                }
            } catch (e) {
                console.log('sigTx: ', e)
            }
            return tx
        }
    }

The eip155:1 in the ISP is working correctly because I'm able to get the address

await provider.connect({
        optionalNamespaces: {
          tron: {
            methods,
            chains: [`tron:${TronChains.Mainnet}`],
            events,
          },
          eip155: {
            methods: [
              'eth_sendTransaction',
              'eth_signTransaction',
              'eth_sign',
              'personal_sign',
              'eth_signTypedData'
            ],
            chains: ['eip155:1'],
            events: ['chainChanged', 'accountsChanged'],
            rpcMap: {
              1: `https://rpc.walletconnect.com?chainId=eip155:1&projectId=${projectId}`
            }
          }
        },
      });

this is what a transaction object looks like.

{
    "chainId": 1,
    "from": "0x831e9A38fbe7Ff0DB6F833596F1dbB34f49a643D",
    "gas": "0x5208",
    "gasPrice": "0xba43b7400",
    "nonce": "0x3",
    "to": "0x6cdBeE3B7EE71c8204C15445C69A7A56Db7b7C14",
    "value": "0x2386f26fc10000"
}

what could be the problem?