I completed all steps for the unit Build a Community with Knowledge and Chat: Enable Live Agent and Communities, but the challenge will not verify. It just continues to spin up without every verifying.

Completely stuck in this trailhead challenge.did everything as per the instruction.
still getting the Below error. ...................
==>Challenge Not yet complete... here's what's wrong:  The Sharing Set is not setup with proper Case access. Please check the requirements.
here my screenshot ...
FYI: i have tried the above in new DE org also

  Thanks In Advance!!