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Heidi SteffenHeidi Steffen 

I tried to log into my trailhead Salesforce Mobile app, but it says it can't find a username that matches what I entered.

I tried to log into my trailhead Salesforce Mobile app, but it says it can't find a username that matches what I entered. I verified with my user in my account that i am using the correct user nam. 
brahmaji tammanabrahmaji tammana
You might be logging in different environment Check the type at right top corner(in general). It would show Production or Sandbox. You can select as per your login and try. It would work.