Hi @Thomas Stuart ,
Thank you for reaching out to us on the Microsoft Q&A forum.
We request you to go through the Knowledge Check now, as we are able to complete the Units and press the 'Check your answers' as shown in the screenshot below:
Please don't hesitate to reach out to us if you have any other queries.
If you found the information helpful, we would greatly appreciate it if you could acknowledge it by selecting the Accept Answer & Upvote options.