Does not work on Avax Fuji Testnet

[devon-bfs]

I copied the mint function and deployed the same contract on chain id 43113.

Changed the contract address based on the chain id selected.

Function works fine on Goerli but when I use 43113 and the associated contract address the console prints the following error

Transaction Hash: {"message":"Error: network changed: 5 => 43113  (event=\"changed\", code=NETWORK_ERROR, version=6.9.0)","errJson":"{\"code\":\"NETWORK_ERROR\",\"event\":\"changed\",\"shortMessage\":\"network changed: 5 => 43113 \"}"}
UnityEngine.MonoBehaviour:print (object)

This is the modified function

async public void OnMintToken()
    {

        string contractAddress = "0xDD6ff2bA7fD02D19e8e4e1d99b65802eD9705437";
        if (ChainId == 5) {
            contractAddress = "0xDD6ff2bA7fD02D19e8e4e1d99b65802eD9705437";
        }
        if (ChainId == 43113) {
            contractAddress = "0x883482eD25eaFad619e20f4A7A93C828B126D9EE";
        }
        // string account = await GetAccount();

        // call publicMint function https://docs.hyperplaygaming.com/api/send-contract-endpoint
        string jsonString = "{ \"contractAddress\": \""+contractAddress+"\", \"functionName\": \"publicMint\", \"params\": [], \"abi\": [{ \"inputs\": [], \"name\": \"publicBurn\", \"outputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }, { \"inputs\": [], \"name\": \"publicMint\", \"outputs\": [], \"stateMutability\": \"nonpayable\", \"type\": \"function\" }], \"valueInWei\": \"0\", \"chain\": { \"chainId\": \""+ChainId+"\" } }";
        byte[] jsonBytes = System.Text.Encoding.UTF8.GetBytes(jsonString);

        UnityWebRequest request = new UnityWebRequest("localhost:9680/sendContract", "POST");
        request.uploadHandler = new UploadHandlerRaw(jsonBytes);
        request.downloadHandler = new DownloadHandlerBuffer();
        request.SetRequestHeader("Content-Type", "application/json");

        await request.SendWebRequest();
        print("Error: " + request.error);
        print("Transaction Hash: " + request.downloadHandler.text);
    }