Facing same problem...I can see notification on the dashboard but sill getting message as:- "Challenge Not yet complete... here's what's wrong: Could not find notification on dashboard. Please check the requirements again."
My issue just got solved. I removed the Number Widget from the name of "Lost Opportunity Number Widget" and saved the noftification just as "Lost Opportunity".
https://developer.salesforce.com/forums/ForumsMain?id=9060G000000UV9FQAW
Please let me know if somebody could help on this
Facing same problem...I can see notification on the dashboard but sill getting message as:-
"Challenge Not yet complete... here's what's wrong: Could not find notification on dashboard. Please check the requirements again."