Hello, I am unable to successfully verify the challenge on the new trailhead badge
Workflow Rule Migration> Map Your Workflow Criteria to Process Criteria.

I get the below error after I have set up the new process with the required criteria nodes. I have tried with 3 different trailhead playgrounds, I get the same error on each one.
"Challenge Not yet complete... here's what's wrong:
There was an unexpected error while verifying this challenge. Usually this is due to some pre-existing configuration or code in the challenge Org. We recommend using a new Developer Edition (DE) to check this challenge. If you're using a new DE and seeing this error, please post to the developer forums and reference error id: TSIPIPWC"

Any pointers would be very helpful...