Why can't I log in as a customer via Merchant Center?

Click on the tab Log in as customer and you'll see all the orders which has been placed by that particular customer

After a customer has placed their first order in your shop, an account is automatically created for them. However, the customer must take the necessary steps to choose a password, which will enable you, as the merchant, to log in as that customer.

If your customers has logged in to their account you can easily log in as that particular customer through Geins built in CMS>Customers

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Click on the tab Log in as customer and you'll see all the orders which has been placed by that particular customer.

NOTE: You can't see the customers password in Merchant center since it's encrypted for your customers safety.