Unable to Complete Trailhead Challenge – "Control Access to Objects" (Required Recruiting Objects Missing)

Hello Trailblazer Community,

I'm trying to complete the Data Security → Control Access to Objects Trailhead challenge, but I'm unable to verify it because the required Recruiting objects are missing.

What I have done

•  Created the Recruiters Permission Set Group. 
•  Created the Manage Positions Permission Set. 
•  Added Manage Positions to the Recruiters Permission Set Group. 
•  Created a brand-new Trailhead Playground and tried again. 

Verification Error

Problem

When I open Setup → Object Manager, the following objects do not exist:

•  Position 
•  Candidate 
•  Job Application 
•  Review 

Since the Position object is missing, I cannot grant the required Read, Create, and Edit permissions in the Manage Positions permission set.

I have already tried:

•  Using my original Playground. 
•  Creating a brand-new Playground. 
•  Recreating the Permission Set and Permission Set Group. 

The required Recruiting objects are missing in both Playgrounds.

Has anyone experienced this recently? Is there a required package or setup step to install the Recruiting sample objects, or is this a known issue with the Trailhead challenge?

Any guidance would be greatly appreciated.

Thank you.