# NCW Signing key not created. asset: ETH\_TEST5, algorithm: MPC\_ECDSA\_SECP256K1

**URL:** <https://community.fireblocks.com/t/ncw-signing-key-not-created-asset-eth-test5-algorithm-mpc-ecdsa-secp256k1/563>\
**Category:** Support\
**Tags:** getting-started\
**Created:** [December 21, 2023, 3:19pm UTC](https://community.fireblocks.com/t/ncw-signing-key-not-created-asset-eth-test5-algorithm-mpc-ecdsa-secp256k1/563 "2023-12-21T15:19:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Analgin](https://avatars.discourse-cdn.com/v4/letter/a/90db22/32.png) [@Analgin](https://community.fireblocks.com/u/Analgin)\
**Post date:** [December 21, 2023, 3:19pm UTC](https://community.fireblocks.com/t/ncw-signing-key-not-created-asset-eth-test5-algorithm-mpc-ecdsa-secp256k1/563/1 "2023-12-21T15:19:51Z")

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Hello,

I am getting the following error in sandbox mode:  
{“error”:“Forbidden”,“message”:“Signing key not created. asset: ETH\_TEST5, algorithm: MPC\_ECDSA\_SECP256K1”}  
I am trying to use the **{{baseUrl}}/ncw/wallets/{{walletID}}/accounts/{{accountId}}/assets/{{assetId}}** endpoint using Postman to add an asset to the account (baseUrl = [https://sandbox-api.fireblocks.io/v1](https://sandbox-api.fireblocks.io/v1)). I have already created a wallet and an account in it. I am using the NCW Admin role. However, I have also tried using NCW Signer, Non-Signing Admin and Editor roles to no avail.  
I understand I need to generate an MPC key on the frontend first, e.g. by using the fireblocks js SDK. But even if I did, what am I to do with the MPC key? I cannot find anything in the docs, NCW docs or API reference about the ‘add asset’ endpoint accepting an MPC key or anyhting signed by the MPC key.

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**Author:** ![janlev](https://avatars.discourse-cdn.com/v4/letter/j/8baadc/32.png) [@janlev](https://community.fireblocks.com/u/janlev)\
**Post date:** [December 27, 2023, 7:20am UTC](https://community.fireblocks.com/t/ncw-signing-key-not-created-asset-eth-test5-algorithm-mpc-ecdsa-secp256k1/563/2 "2023-12-27T07:20:50Z")

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Hey @Analgin , you must first generate a set of MPC keys. You may further read here:

> **[MPC Key Generation](https://ncw-developers.fireblocks.com/docs/mpc-key-generation)**
>
> OverviewThe creation of multi-party computation (MPC) keys involves a dynamic, step-by-step procedure that involves several rounds of communication between your backend and the Fireblocks API. This process operates asynchronously, meaning that it...