# Error: Unsupported chain namespace

**URL:** <https://builder.metamask.io/t/error-unsupported-chain-namespace/954>\
**Category:** Embedded Wallets (Web3Auth)\
**Created:** [September 4, 2025, 6:18am UTC](https://builder.metamask.io/t/error-unsupported-chain-namespace/954 "2025-09-04T06:18:00Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![srinath](https://avatars.discourse-cdn.com/v4/letter/s/aca169/32.png) [@srinath](https://builder.metamask.io/u/srinath)\
**Post date:** [September 4, 2025, 6:18am UTC](https://builder.metamask.io/t/error-unsupported-chain-namespace/954/1 "2025-09-04T06:18:00Z")

</div>

> **🏛 Content from Web3Auth Community**
> 
> This topic was originally posted by **srinath** on 9/4/2025.  
> This content has been migrated from our previous community forum to preserve valuable discussions.

* * *

I am using “@web3auth/modal”: “^10.3.0”,  
This is my code

```auto
import {
  AUTH_CONNECTION,
  CHAIN_NAMESPACES,
  CommonPrivateKeyProvider,
  IProvider,
  WALLET_CONNECTORS,
  WEB3AUTH_NETWORK,
  Web3Auth,
} from "@web3auth/modal";
import { useEffect, useState } from "react";
const clientId = “BNPm6P51gixcR2YhGlFPAh2YQ_G5tZ6oXTF1NXqfrvXuiPsfpPTML-zn1Ah66q6x55gmF_grh9qtsbD3byMPh-4”;
const sentinelChainDetails = {
blockExplorerUrl: “https://explorer.chainroot.io/sentinel”,
chainId: “sentinelhub-2”,
chainNamespace: CHAIN_NAMESPACES.OTHER,
displayName: “Sentinel”,
logo: “https://raw.githubusercontent.com/cosmos/chain-registry/master/sentinel/images/dvpn.svg”,
rpcTarget: “https://rpc.sentinel.co:443”,
ticker: “dVPN”,
tickerName: “Sentinel”,
};
const privateKeyProvider = new CommonPrivateKeyProvider({
config: {
chain: sentinelChainDetails,
chains: [sentinelChainDetails],
},
});
const web3auth = new Web3Auth({
clientId,
mfaLevel: “none”,
privateKeyProvider,
web3AuthNetwork: WEB3AUTH_NETWORK.SAPPHIRE_DEVNET,
});
await web3auth.init();
function MyApp() {
const [provider, setProvider] = useState<IProvider | null>(null);
const loginGoogle = async () => {
const status = await web3auth.connectTo(WALLET_CONNECTORS.AUTH, {
authConnection: AUTH_CONNECTION.GOOGLE,
});
setProvider(status);
};
const loginEmail = async () => {
const status = await web3auth.connectTo(WALLET_CONNECTORS.AUTH, {
authConnection: AUTH_CONNECTION.EMAIL_PASSWORDLESS,
loginHint: “srinath@exidio.co”,
});
setProvider(status);
};
useEffect(() => {
console.log(web3auth, provider);
}, [provider]);
return (
<div>
<button onClick={loginGoogle}>Login with Google</button>
<button onClick={loginEmail}>Login via Email</button>
<button onClick={() => web3auth.logout()}>Logout</button>
</div>
);
}
export default function AppWrapper() {

```

After login with EMAIL\_PASSWORDLESS, I am getting Error: Unsupported chain namespace…  
And when I login with Google: I am getting the below screen even after `mfaLevel: "none",`

[![Screenshot 2025-09-04 at 11.47.31](https://canada1.discourse-cdn.com/flex011/uploads/metamaskbuilderhub/original/1X/509d136e6fd44f5f4354ebf6da5582aedb60dbbc.png)
Screenshot 2025-09-04 at 11.47.312406×1536 157 KB
](https://web3auth.io/community/uploads/default/original/2X/9/952ad2784e9d4753b07192ec80beaa228e2304bd.png "Screenshot 2025-09-04 at 11.47.31")

Also, let me know how to implement this  
const handleWeb3AuthConnected = useCallback(  
async (event) =\> {  
try {  
console.log(“::CONNECTED::”, event);  
const idToken = await window.web3auth.authenticateUser();

```
    const user = await window.web3auth.getUserInfo();
const privateKey = await event.provider.request({ method: "private_key" });

if (privateKey) {
  const appPubKey = getPublicCompressed(window.Buffer.from(privateKey.padStart(64, "0"), "hex")).toString("hex");

  const accessToken = await accountServices.fetchPublicKey({ appPubKey, idToken: idToken.idToken });
  
  const details = await accountServices.fetchUserDetailsWithPublicKey({ publicKey: `${accessToken}` });

  dispatch(
    UPDATE_AUTH_DETAILS({
      accessToken,
      address: details.sentinelAddress,
      authProvider: user.typeOfLogin,
      creditCoins: 0,
      expiredAt: details.expiredAt,
      profileImage: user.profileImage,
    })
  );
}

```

);

---

<div class="post-metadata">

**Author:** ![w3abot](https://avatars.discourse-cdn.com/v4/letter/w/4da419/32.png) [@w3abot](https://builder.metamask.io/u/w3abot)\
**Post date:** [September 4, 2025, 6:19am UTC](https://builder.metamask.io/t/error-unsupported-chain-namespace/954/2 "2025-09-04T06:19:52Z")

</div>

Thank you for providing detailed information and your code snippet. Here’s a summary of your issue and some guidance:

* * *

### Issue Summary

**Platform & SDK Details:**

- **Platform:** Web (React)
- **SDK:** @web3auth/modal
- **SDK Version:** ^10.3.0

**Problem 1:**  
When logging in with `EMAIL_PASSWORDLESS`, you receive the error:

> Error: Unsupported chain namespace

**Problem 2:**  
When logging in with Google, you see an MFA (Multi-Factor Authentication) screen, even though you set `mfaLevel: "none"`.

**Custom Chain Configuration:**

- You are using a custom Cosmos chain (Sentinel) with `chainNamespace: CHAIN_NAMESPACES.OTHER`.

**Code Provided:**  
You have shared your Web3Auth initialization and login methods.

**Screenshot:**  
You included a screenshot showing the unexpected MFA prompt (not visible here, but referenced).

* * *

### Analysis & Next Steps

#### 1. **Unsupported Chain Namespace Error**

- The Web3Auth Modal SDK currently supports EVM (`CHAIN_NAMESPACES.EIP155`) and Solana (`CHAIN_NAMESPACES.SOLANA`) out of the box.

- Using `CHAIN_NAMESPACES.OTHER` for Cosmos-based chains (like Sentinel) is not fully supported in Plug and Play (PnP) mode. This is why you see the “Unsupported chain namespace” error.

#### 2. **MFA Screen Appearing Despite `mfaLevel: "none"`**

- The `mfaLevel` parameter can sometimes be overridden by project-level settings on the [Web3Auth Dashboard](https://dashboard.web3auth.io/).

- Ensure that MFA is not enforced at the dashboard/project configuration level.

- Also, make sure you are using the correct enum value:

* * *

### Action Items for You

1. **For Cosmos Chain Support:**

2. **For MFA Issue:**

* * *

### Additional Questions (if needed):

- Are you planning to use only Cosmos chains, or do you also need EVM/Solana support?
- Have you checked the browser console for any additional error messages? If so, please share screenshots or logs.

* * *

Let me know if you need more detailed guidance on migrating to Core Kit or have any other questions!

> Note: This response was generated by an AI bot and may require further verification. The Web3Auth support team has tracked this issue and will be responding as soon as possible.

> Additionally, we would recommend you to join our biweekly Office Hours to get this resolved even faster. [Web3Auth Developer Office Hours](https://web3auth.io/community/t/web3auth-developer-office-hours/8777)

---

<div class="post-metadata">

**Author:** ![bsrinath4839](https://yyz1.discourse-cdn.com/flex011/user_avatar/builder.metamask.io/bsrinath4839/32/9_2.png) [@bsrinath4839](https://builder.metamask.io/u/bsrinath4839)\
**Post date:** [September 6, 2025, 5:10am UTC](https://builder.metamask.io/t/error-unsupported-chain-namespace/954/3 "2025-09-06T05:10:02Z")

</div>

Please look into this.

---

<div class="post-metadata">

**Author:** ![maharshi](https://yyz1.discourse-cdn.com/flex011/user_avatar/builder.metamask.io/maharshi/32/1525_2.png) [@maharshi](https://builder.metamask.io/u/maharshi)\
**Post date:** [September 9, 2025, 7:15am UTC](https://builder.metamask.io/t/error-unsupported-chain-namespace/954/4 "2025-09-09T07:15:45Z")

</div>

Set up this chain on the dashboard and turn this chain on. Let me know if you gave any difficulty there.