Check Challenge looks for the name of the action to be: New Detailed Account 

The system does not allow you to add a name with spaces.  It has to be: NewDetailedAccount

Thus, check challenge fails.  Check Challenge should look for name: NewDetailedAccount, not: New Detailed Account

Error: Name: The Action API Name can only contain underscores and alphanumeric characters. It must be unique, begin with a letter, not include spaces, not end with an underscore, and not contain two consecutive underscores.

Check Challenge looks for the name of the action to be: New Detailed Account 

The system does not allow you to add a name with spaces.  It has to be: NewDetailedAccount

Thus, check challenge fails.  Check Challenge should look for name: NewDetailedAccount, not: New Detailed Account

Error: Name: The Action API Name can only contain underscores and alphanumeric characters. It must be unique, begin with a letter, not include spaces, not end with an underscore, and not contain two consecutive underscores.