Solidity Testing – Getting Contract from Forked Testnet Using Hardhat

when I run hardhat on forked testnet and try to run test script that includes

dai = await ethers.getContractAt("IERC20", DAI)

I get this error:

NomicLabsHardhatPluginError: 0x6B175474E89094C44Da98b954EedeAC495271d0F is not a contract account.

I tried different addresses but nothing seems to work.

this is my hardhat config.js

I use quicknode as url

  networks: {
        hardhat: {
            hardfork: "merge",
            // If you want to do some forking set `enabled` to true
            forking: {
                url: `${process.env.QUICKNODE_API_KEY_MUMBAI}`,
                //blockNumber: FORKING_BLOCK_NUMBER,
                enabled: true,
            },
            chainId: 31337,
        },
        localhost: {
            chainId: 31337,
        },

And ran it as follows: npx hardhat node –network hardhat and it works fine