OpenZeppelin onlyOwner modifier doesn't work properly - blockchain

Question

In the Remix, getICOMembers function works appropriately and returns all members of a specific ICO type after they are added to the icoMembers mapping.
mapping(uint256 => address[]) private icoMembers;
function getICOMembers(uint256 _icoType) external view onlyOwner returns (address[] memory)
{
return icoMembers[_icoType];
}
0 1
But Etherscan gives this error even if I connected by owner address.
deployer address owner address etherscan error
Also, this function has onlyOwner modifier too but it works.
ICOdata[] private ICOdatas;
function getICODatas() external view onlyOwner returns (ICOdata[] memory)
{
return ICOdatas;
}
getICODatas function output
I tried to add members by hardcoding instead of joining the token sale function, changing external to public but it still gives the same error.
Also, this is the constructor.
constructor(
address _token,
address payable _usdtWallet,
address _vestingContract
) {
require(
address(_token) != address(0),
"ERROR at Crowdsale constructor: Token contract address shouldn't be zero address."
);
require(
_usdtWallet != address(0),
"ERROR at Crowdsale constructor: USDT wallet address shouldn't be zero address."
);
require(
_vestingContract != address(0),
"ERROR at Crowdsale constructor: Vesting contract address shouldn't be zero address."
);
token = ERC20(_token);
usdtWallet = _usdtWallet;
totalAllocation = 0;
vestingContract = IVesting(_vestingContract);
transferOwnership(msg.sender);
}

Answer 1

A view function is usually invoked using a read-only call - not using a transaction.
Unlike transaction, a call is not signed by any private key. So you can specify any from address that is reflected as the value of msg.sender.
Then it depends on the specific implementation of the UI and of the node that processes the call. My guess is that Remix IDE uses the currently selected address from the accounts list as msg.sender (which passes the onlyOwner validation), while Etherscan uses the zero address (which fails the validation).