Trouble accessing the agent force play gorund

Hello,

I  am trying to complete my module," from 

1. (Get Ready for Agentforce>>QuickStart: Build Your First Agent with Agentforce>>
2. Configure an Agentforce Service Agent.)

Configure an Agentforce Service Agent". It does not allow me access the play ground I created with new credentials provided.

I tried refreshing, logging, but nothing seemed to work.

And also I have deleted the other orgs too:

FYI

Can you please suggest?

Thanks

#Trailhead Challenges