In an application I am writing, I require the user to state a contact's full name. I have a disagreement with my marketing director regarding the correct wording for when the user doesn't know the full name. I want to help this user and so I am giving him a tip on what to do when the contact's full name is not known. The tip has a title then a body with an explanation of what to do.
My question is, what should be the title of this tip? Is it “Not sure what the contact’s full name is? or “Not sure what is the contact’s full name"?
When is it correct to use either? There is a similar question here but I didn't fully understand it or whether it pertains to my phrase: "I'm not sure what the right way is"