WalletConnect multi chain transactions not working

[devamitsharma101]

Versions I'm using

    "@walletconnect/core": "^2.17.0",
    "@walletconnect/modal": "^2.7.0",
    "@walletconnect/sign-client": "^2.17.0",
    "@walletconnect/utils": "^2.17.0",

This is how, Initialize

import { SignClient } from '@walletconnect/sign-client';
import { WalletConnectModal } from '@walletconnect/modal';
import Core from '@walletconnect/core';


const wcProjectId = process.env.REACT_APP_WALLET_CONNECT_PROJECT_ID
export const wcCore = new Core({
    projectId: wcProjectId,
});

const wcMetadata = {
    name: GAMEPAY_LABEL,
    description: GAMEPAY_DESCRIPTION,
    url: window.location.href ?? 'https://s9y.gg',
    icons: ["https://demo.s9y.gg/favicon.ico"],
};

export const wcSignClient = await SignClient.init({ core: wcCore, metadata: wcMetadata, projectId: wcProjectId });

export const walletConnectModal = new WalletConnectModal({
    projectId: wcProjectId,
    // `standaloneChains` can also be specified when calling `walletConnectModal.openModal(...)` later on.
    // standaloneChains: ['eip155:1']
})

This is how I make WC Connections

      export const walletConnectOptionalMethods = () => {
        return [
          "eth_sendTransaction",
          "personal_sign",
          "eth_accounts",
          "eth_requestAccounts",
          "eth_sendRawTransaction",
          "eth_sign",
          "eth_signTransaction",
          "eth_signTypedData",
          "eth_signTypedData_v3",
          "eth_signTypedData_v4",
          "wallet_switchEthereumChain",
          "wallet_addEthereumChain",
          "wallet_getPermissions",
          "wallet_requestPermissions",
          "wallet_registerOnboarding",
          "wallet_watchAsset",
          "wallet_scanQRCode"
        ]
      }

      export const walletConnectRequiredMethods = () => {
        return [
          "eth_sendTransaction",
          "personal_sign"
        ]
      }
      
      export const walletConnectOptionalEvents = () => {
        return ['chainChanged', 'accountsChanged', 'message', 'disconnect', 'connect']
      }
      
      export const walletConnectRequiredEvents = () => {
        return ['chainChanged', 'accountsChanged']
      }


      const { uri, approval } = await wcSignClient.connect({
        // Optionally: pass a known prior pairing (e.g. from `signClient.core.pairing.getPairings()`) to skip the `uri` step.
        // pairingTopic: pairing?.topic,
        // Provide the namespaces and chains (e.g. `eip155` for EVM-based chains) we want to use in this session.
        requiredNamespaces: {
          eip155: {
            methods: walletConnectRequiredMethods(),
            chains: [`eip155:${Number(SingularityGlobal.singularityClientChainId)}`],
            events: walletConnectRequiredEvents(),
            rpcMap: getChainsRpcMap()
          }
        },
        optionalNamespaces: {
          eip155: {
            methods: walletConnectOptionalMethods(),
            chains: listOfChainsIdsExceptRequiredOne(),
            events: walletConnectOptionalEvents(),
            rpcMap: getChainsRpcMap()
          }
        }
      })

      window.parent.postMessage(
        JSON.stringify({
          metaData: uri,
          name: `SingularityEvent-getWalletConnectConnectionUriRes`
        }),
        referrer
      )

      // Open QRCode modal if a URI was returned (i.e. we're not connecting an existing pairing).
      if (uri) {
        walletConnectModal.closeModal()
        if(showModal){
          walletConnectModal.openModal({ uri })
        }
        // Await session approval from the wallet.
        const session = await approval()

        // Handle the returned session (e.g. update UI to "connected" state).
        // * You will need to create this function *
        const accountData = onWalletConnectSessionConnected(session)
        // Close the QRCode modal in case it was open.
        walletConnectModal.closeModal()
        return accountData
      }

The chains passed here in required namespace is ['eip155:19011'] and chains passed in the optional namespace is ['eip155:248']

This is how try to send transaction

    const result = await wcSignClient.request({
      topic: wcSessionInstance?.topic,
      chainId: chainIdToPass,
      request: {
        method: "eth_sendTransaction",
        params: [
          {
            ...txData
          }
        ],
      }
    });

It works when the chainIdToPass to 'eip155:19011' but not when 'eip155:248'

I tried to pass only the required namespaces chains as ['eip155:19011', 'eip155:248'] skipping optional namespaces, but than connection is only not working.

I'm trying it with Metamask Mobile on IOS. I've already made sure both the chains are already added in metamask