Lightning Out has some limitations, as highlighted here:
- Not all the events provided by the component framework are supported. Some events work only inside Salesforce Lightning Experience, as they leverage one.app container. one.app container is comprised of a set of JavaScript events and functions that are only available in Salesforce Lightning Experience and the Salesforce 1 mobile application.
- Not all standard components are supported in Lightning Out. Specifically, ones that are dependent on the one.app container library are not supported.
- Lightning Out requires customers to allow third-party cookies in their browser settings.