Verify Contract in Truffle "No BscScan API Key provided" with correct API Key

Smart Contracts
1

I am trying to verify a contract with truffle and it does not detect my api key.

truffle run etherscan BEP20Token@0xEC2b1F41E90590cfc44c090DFdeed9DCb55eE000 --network testnet --debug
DEBUG logging is turned ON
Running truffle-plugin-verify v0.5.21
Retrieving network's chain ID
No BscScan API Key provided

It was the first time that my api key gave me problems. I created a new one and it hasn't worked either.

My contract lacks constructor arguments which are often the cause of verification problems. Does not have.

this is my truflle-config-.js:

require('dotenv').config();
const HDWalletProvider = require('truffle-hdwallet-provider-privkey');
const privateKey = [process.env.PRIVATE_KEY];
const apiUrl = process.env.API_URL;
const etherscanAPIBSC = process.env.ETHERSCAN_API_KEY;

module.exports = {

  networks: {
    development: {
      host: "127.0.0.1",
      port: 7545,
      network_id: "*" //match any network id
    },
    // rinkeby: {
    //   provider: function() {
    //     return new HDWalletProvider(
    //       privateKeys.split(','), // array of private keys
    //       `https://rinkeby.infura.io/v3/${process.env.INFURA_API_KEY}` // Url to an Ethereum node
    //     )
    //   },
    //   gas: 5000000,
    //   gasPrice: 25000000000,
    //   network_id: 4
    // },
    // Useful for deploying to a public network.
    // NB: It's important to wrap the provider as a function.
     testnet: {
      provider: () => new HDWalletProvider(privateKey, `${apiUrl}`),
      network_id: 97,
      confirmations: 10,
      timeoutBlocks: 200,
      skipDryRun: true
    },
  },
  contracts_directory: './src/contracts',
  contracts_build_directory: './src/abis',
  plugins: [
    'truffle-plugin-verify'
  ],
  // Configure your compilers
  compilers: {
    solc: {
      optimizer: {
        enabled: true,
        runs: 200
      },
      version: "^0.8.0" 
    }
  },
  api_keys: {
    etherscan: etherscanAPIBSC
  }
};

I try to verify on the bsc testnet

Install the library correctly

  "devDependencies": {
    "@openzeppelin/contracts": "^4.2.0",
    "@openzeppelin/test-helpers": "^0.5.12",
    "dotenv": "^10.0.0",
    "truffle": "^5.3.14",
    "truffle-hdwallet-provider-privkey": "^0.3.0",
    "truffle-plugin-verify": "^0.5.21",
    "webpack": "^4.46.0"
  },

I do not know what is the problem. Is there any way to verify that my api works?