Magento 2.1 – Second Store View with Symlinks: ‘Requested Store Not Found’

At line 164 add the below code of Magento\Store\Model\StoreManager:

    if(!$storeId){
        if(isset($_COOKIE['store']) && $_COOKIE['store'] !== ''){
            $storeId = $_COOKIE['store'];
        } else {
            $storeId = $this->getDefaultStoreView()->getCode();
        }           
    }

And then, change 155 line of Magento\Store\Model\StoreManager

=> FROM :

if (null === $this->currentStoreId) {

=> To :

if (null === $this->currentStoreId || '' === $this->currentStoreId) {

Try to use this query in your database :

UPDATE `store` SET store_id = 0 WHERE code='admin';

UPDATE `store_group` SET group_id = 0 WHERE name='Default';

UPDATE `store_website` SET website_id = 0 WHERE code='admin';