Authentication returning false when i pass username and password in my extension. magento2.3

[kales]

Hello magento lovers,

I have extension where we pass username and password and fetch data in xml format it was working fine till magento 2.2

In earlier edition Magento 2.3 it returning false .

       $storageInterface = $this->_objectManager->get(
            '\Magento\Backend\Model\Auth\Credential\StorageInterface'
        );

       $userAuthentication = $storageInterface->authenticate(
            $Username,
            $Password
        ); // this returning false with appropriate credential

this is index.php in my extension can anyone help me here.

Thank you