I have enrolled for Google IT Support professional certificate. I am on 1st course(Technical Support Fundamentals) and 2nd Course(The Bits and Bytes of Computer Networking) is compleate, I have now reached on 3rd course(Operating Systems and You: Becoming a Power User) curriculum. But when I try to open Graded External Tool it says that
"This item will be unlocked when the session begins"
What to do??