Scheduled maintenance on Envia.com: Thursday, October 29, 12:00–12:30 a.m. Login, APIs, and operations will be unavailable.
If you try to connect your ecommerce store in Envia.com and see the Store already installed message, that store was already linked to another Envia.com account.

So the support team can help you release the store:
Copy the exact link (URL) of the page where the “Store already installed” message appears.
Send that link to the support team.
Make sure you use the correct username associated with the store, especially if you are connecting a marketplace.
When the system asks for the store name, enter your marketplace username, not the platform name. For example, if you sell on Amazon, do not type “Amazon”. Enter your registered username. Entering the marketplace name can trigger the “Store already installed” error.