New stores created on StoreFront are showing error: "404 - File or directory not found" at launch. Old stores can be launched properly.
When new stores are created in environments with more than one StoreFront server, the changes have to be propagated to all the other StoreFront servers by going to the StoreFront console > Server Group (left panel) > Propagate Changes (right panel).
Changes have not been propagated to other existing StoreFront servers.