As store owners may concern, you cannot set minimum quantity for configurable product in Magento 2. So I recommend a new extension called Magento 2 Minimum Quantity of Configurable Product (https://bsscommerce.com/minimum-quantity-of-configurable-product-for-magento-2.html).
This extension is quite simple to configure and also has reasonable price for its amazing feature: set minimum quantity for specific or all configurable products as wish. In addition, the module can show error message when customers don’t meet the quantity requirement.
Here is an example:
(https://bsscommerce.com/media/wysiwyg/infortis/screenshot/Show_error_message_to_notify_the_allowed_quantity_for_purchase.png)
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