I am unable to complete this challenge (Enable Sales Coaching in Agentforce)

 I am unable to complete this challenge. I am getting this error message for the below challenge: 

Error :  Sales Coach Agent can't be assigned the Agentforce Sales Coach User permission set license, because Sales Coach Agent's user license doesn't support it.  

Grant Users Access to Sales Coaching

For this project, you need to assign yourself some permissions that let you configure and use the Agentforce sales coaching agent.

1. From the Agentforce Sales Coach Setup page, click Step 3: Grant Access to Agentforce Sales Coach to expand this section.
2. Click the first Go to Permission Sets next to Assign Users to Manage Agentforce Sales Coach.
3. This opens a new tab where you can assign the Manage Agentforce Sales Coach permission set. Click Add Assignments.
4. Check the box next to YOUR NAME, click Assign, and click Done. You’ve now granted yourself the ability to manage Agentforce Sales Coach. You can close this tab and return to the Agentforce Sales Coach Setup tab.
5. In Step 3: Grant Access to Agentforce Sales Coach, click Go to Permission Sets next to Assign Users to Access Agentforce Sales Coach.
6. This opens a new tab where you can assign the Use Agentforce Sales Coach permission set. Click Add Assignments.
7. Check the box next to YOUR NAME, click Assign, and click Done. You now can use Agentforce Sales Coach. You can close this tab and return to the Agentforce Sales Coach Setup tab.

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