I'm trying to complete the module Fundamentals of "Knowledge Mining and Azure AI Search" in the AI-900 cert training, but I can't access four of the twelve units (Use a skillset to define an enrichment pipeline, Understand indexes, Use an indexer to build an index, and Persist enriched data in a knowledge store).
If I look at the module from the learning path page, all twelve units are linked under it: https://learn.microsoft.com/en-us/training/paths/document-intelligence-knowledge-mining/
However, if I try to click on one of the four units I mentioned, this page for the module opens instead. The module has the same name, but only 8 units. https://learn.microsoft.com/en-us/training/modules/intro-to-azure-search/
What's causing the issue? Do I need to complete those 4 units? How do I access them?
Thank you.