My dev org does not appear on the list of hands-on org on different challenges for AgentForce. I have two playground org but Einstein Setup does not show on them

I am trying to complete a set of AgentForce related trails from the following Trailmix: 

I was able to create a dev org for the first parts for Coral Cloud Resorts and was able to proceed and complete the challenges under them. 

But when I started this module:

I can no longer select my dev org and only two of my non-dev org playground appears on the selection. 

I have tried several fixes and made sure that I am logged into trailhead using the credentials for the dev org but none of them are working and the dev org still does not show up as a selection. I have tried to clear cache and remove my entire browser history just to check if it's a cache issue but nothing still works. 

Here's a screenshot of the org selection when I go to the challenge: 

As mentioned earlier, I tried connecting my dev org by clicking on the Connect Org button and logging in using its credentials and then it takes me back to the module page and the dev org still does not appear as an option from the list of available org. 

When I click on Manage Orgs, it shows up as the Agentforce dev org I previously used to complete the first few challenges. Here is a screenshot for reference: 

Is there a way I can fix this or other ways to connect the dev org on Trailhead so I can finish the challenge and credit the work I've done on the dev org? 

Thank you.