The lesson is fine and so is your access. The video attached to it has not finished processing. Every video uploaded to a course is converted before it can be streamed, and until that finishes the lesson page shows a line of text where the player would be, ending "Check back shortly".
There is nothing to fix at your end. Come back to the lesson later.
A course video moves through four states
- Uploading. The file is still being transferred from the author's machine.
- Transcoding. The upload is in and the video is being converted into the versions the player streams. This is where a lesson spends most of its waiting, and a long video takes longer than a short one.
- Ready. The player appears. Nothing announces it, so reload the lesson to find out.
- Failed. The conversion did not complete. The video will not appear until the course team uploads it again.
The lesson page names the current state in brackets, so the line reads "This video is still processing (TRANSCODING). Check back shortly."
A failed video reads as "still processing" too
Worth knowing before you wait a week for it. The same sentence is shown for a video that failed as for one still converting, so the message clearing is the only signal you get. Treat a message that has not changed by the next day as a failure and report it. Reloading, signing out or trying another browser changes nothing, because the state sits on the course rather than on you.
What still works while a lesson waits
Every other lesson plays normally, and reading lessons, quizzes and assignments are unaffected. What you cannot do is complete the waiting lesson: a video lesson only completes once 90% of it has been watched, so it stays open, and your course percentage stops short of 100%.
If your course has a final exam that requires every lesson complete, one unprocessed video holds it shut. The final exam is locked covers how to find the lesson that is holding it.
Reporting it
Send the course name and the lesson title to human support. Fixing it means the author re-uploading the file, so the sooner it is reported the sooner the lesson works.