I am currently logged into the Trailhead Playground and attempting to complete a challenge but I keep receiving an error message: "Challenge Not yet complete... here's what's wrong: 
The 'Account Manager' contact role for 'Acme Corporation' could not be found or it is not set to the current user. Please also make sure you've enabled Account Teams and have added yourself to the Account Team."

I have followed the steps according to the directions provided but have not been succesful. Please help!