Each store can be connected to only one organization at a time. The most common case is having connected that store in a previous organization, sometimes one you've already deleted.
Deleting the organization doesn't release the store's connection. That's why an organization that no longer exists can be blocking your current store from connecting.
How to fix it
- If the previous organization still exists, you can disconnect the store yourself from its settings.
- If you already deleted it, write to us with your current organization or your store's domain and we'll release it.