I've set up my 1st contact on Messenger without a problem but it won't now add the 2nd contact = it keeps going round in circles!
Method I'm using is click on 'Add a contact' - dialog box apppears with 3 options. I choose 'Create a new contact from an email address' > Next > Insert new contact's complete email address > Next > 'Add a contact' dialog box states '[email protected] could not be added to your contact list because its owner has not signed up for a Microsoft Passport Account'
I'm sure that my friend said he had used Messenge in the past to contact someone else but I'll obviously double check with him. However, is it possible he could have used Messenger via another site such as click here for which he has a different email address?