Defender minting issue (unable to mint a token)

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Hey @spalladino ! Thanks for your help! Please find the address, network and code of the token contract as below (it's actually the sample code from Manage an ERC20 token using Defender Admin and Gnosis Safe)

  1. address : 0x52a75Fbd3796211d8F7FE8d4028e912e1a76EA9c
  2. Network : rinkeby
  3. code as below :
// SPDX-License-Identifier: MIT
// Based on https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.2.0/contracts/presets/ERC20PresetMinterPauser.sol
pragma solidity ^0.6.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.2.0/contracts/access/AccessControl.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.2.0/contracts/GSN/Context.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.2.0/contracts/token/ERC20/ERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.2.0/contracts/token/ERC20/ERC20Burnable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v3.2.0/contracts/token/ERC20/ERC20Pausable.sol";

contract MyToken is Context, AccessControl, ERC20Burnable, ERC20Pausable {
    bytes32 public constant MINTER_ROLE = keccak256("MINTER_ROLE");
    bytes32 public constant PAUSER_ROLE = keccak256("PAUSER_ROLE");

    /**
     * @dev Grants `DEFAULT_ADMIN_ROLE`, `MINTER_ROLE` and `PAUSER_ROLE` to the
     * account.
     *
     */
    constructor(string memory name, string memory symbol, address account) public ERC20(name, symbol) {
        _setupRole(DEFAULT_ADMIN_ROLE, account);

        _setupRole(MINTER_ROLE, account);
        _setupRole(PAUSER_ROLE, account);
    }

    /**
     * @dev Creates `amount` new tokens for `to`.
     *
     * Requirements:
     *
     * - the caller must have the `MINTER_ROLE`.
     */
    function mint(address to, uint256 amount) public virtual {
        require(hasRole(MINTER_ROLE, _msgSender()), "MyToken: must have minter role to mint");
        _mint(to, amount);
    }

    /**
     * @dev Pauses all token transfers.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function pause() public virtual {
        require(hasRole(PAUSER_ROLE, _msgSender()), "MyToken: must have pauser role to pause");
        _pause();
    }

    /**
     * @dev Unpauses all token transfers.
     *
     * Requirements:
     *
     * - the caller must have the `PAUSER_ROLE`.
     */
    function unpause() public virtual {
        require(hasRole(PAUSER_ROLE, _msgSender()), "MyToken: must have pauser role to unpause");
        _unpause();
    }

    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual override(ERC20, ERC20Pausable) {
        super._beforeTokenTransfer(from, to, amount);
    }
}