'Metamask Private Key Too Long

I pulled the private key from Metamask (a 64 character string), set it in the .env file, yet whenver I try to deploy, I get this error:

Invalid account: #0 for network: rinkeby - private key too long, expected 32 bytes

My hardhat.config.js file is pretty boring (AKA straight from OpenSea's example).

/**
 * @type import('hardhat/config').HardhatUserConfig
 */

require("dotenv").config();
require("@nomiclabs/hardhat-ethers");
require("./scripts/deploy.js");

const { ALCHEMY_KEY, ACCOUNT_PRIVATE_KEY } = process.env;

module.exports = {
  solidity: "0.8.1",
  defaultNetwork: "rinkeby",
  networks: {
    hardhat: {},
    rinkeby: {
      url: `https://eth-rinkeby.alchemyapi.io/v2/${ALCHEMY_KEY}`,
      accounts: [`0x${ACCOUNT_PRIVATE_KEY}`],
    },
    ethereum: {
      chainId: 1,
      url: `https://eth-mainnet.alchemyapi.io/v2/${ALCHEMY_KEY}`,
      accounts: [`0x${ACCOUNT_PRIVATE_KEY}`],
    },
  },
};

I see a ton of folks out there with private keys that are too short, but I seem to be one of the few with this joyous error!

Yeah, yeah. I know MetaMask gives me 64 characters and the error clearly says 32. That’s the issue. Is there a conversion or something I need to do?

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'Metamask Private Key Too Long

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