To unlock all content in the Lifetime apps and website, you'll need to have a Hulu + Live TV plan. A Hulu Basic plan does not provide access to locked episodes and sign in may not work as expected without Live TV included on your Hulu account. If you have a basic Hulu plan, you can either upgrade your package with Hulu or you can watch unlocked episodes from Lifetime.
If you are a Hulu + Live TV subscriber and are getting an error message on certain movies, it may be because LMN also needs to be in your TV package to view the movie. LMN is not included in Hulu + Live TV plans, so you will not have access to certain LMN movies in the Lifetime app.