I'm an ELA teacher trying to link HMH assignments to Schoology. When I got to "Add Materials" the HMH Ed Linking Tool is on the side. It takes me to the website and when I try to assign work using the "Create LMS Link" it is able to post the link on my Schoology page. However when I click on the newly created link I get a message that says "Cannot launch resource because either it or the user cannot be found." How can I fix this?