I have submit my postman 15days challenge collection but getting fail badge message

Hey there!
Your submission for the Postman badge failed one or more tests. Please fix the issues, save your changes, then resubmit in order to get your badge.
Make sure your workspace contains all of your collections (at least 18), an environment, an API, and a mock server. Also make sure that the name of the workspace doesn’t contain one of the following words: 15, fifteen, postman, day, challenge, test, testers

whereas I have checked everything is passed? can anyone help me please.