Shopify - Operation failed: Unable to find a singular Admin user in Mintsoft

This error (Operation failed: Unable to find a singular Admin user in Mintsoft) is caused by the same e-mail address being used multiple times with different accounts (either Warehouse or Client user accounts). You'll need to ensure that your Mintsoft login uses a unique e-mail address before setting up the connector. If you are unsure exactly which accounts are using your e-mail address multiple times, please speak with the Mintsoft support team or raise a support ticket.