Magento 2: Requested store is not found

I just recently came across this same situation after migrating from Magento 1.6.1.0 to 2.1.4 and hope my answer can be of assistance. The problem came from deleting multiple stores 96 of them to be exact. I tried all the other answers here but was still getting the same error.

The fix for me was removing the old store data from inside of the "core_config_data". The problem is that when the Magento is loading the run time configuration data it is finding the old stores and trying to resolve them. Before cleaning the data from the database I HIGHLY recommend you run the SELECT query below to make sure you delete the correct stores.

SELECT * FROM core_config_data WHERE scope = 'stores';

WARNING: MAKE SURE TO BACKUP YOUR DATABASE BEFORE RUNNING THIS!

DELETE FROM core_config_data WHERE scope_id != 1 AND scope = 'stores';

You need to run the following query in your database, and then try to open the website.

SET FOREIGN_KEY_CHECKS=0;
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';
UPDATE `customer_group` SET customer_group_id = 0 WHERE customer_group_code='NOT LOGGED IN';
SET FOREIGN_KEY_CHECKS=1;

In this case, I have to restore that tables store, store_group, store_website. As it was before the migration Magento 2