Anyone experience an issue with "Build a Data Processing Engine" verification?

Anyone had issues verifying "Build a Data Processing Engine" within the "Create Fundraising Rollups with Data Processing Engine" badge? I've looked over every detail, and I didn't feel this was particularly difficult or tricky, so I'm not sure why I am getting this generic fail: 

Step not yet complete in Agentforce Nonprofit Training

Whoops, looks like there was a problem. Please try again. 

I did have a user error in the previous module ("Prepare for your New Rollups") that required me to delete a definition and modify a flow to version 2, but that module passed, and I don't see how it could impact this work. 

I appreciate any insight anyone can provide!