Windows 10 Live Mail sync between desktop and laptop

When trying to get my MSN email to sync between my desktop and my laptop I get the message "Please enter your PIN to sign in" on my laptop.  What is this ? Both machines are running Windows 10 and Windows Live Mail 2012.  I have several email addresses and all others sync except my MSN address.  I tried deleting it completely from my laptop and re adding it and I get the same message "Please enter your PIN to sign in".  When I ignore that message and get to my email, I get the following message "Windows Live Mail is synchronizing this account.  Check back in a few minutes to read your messages."  This message has appeared for several hours with no activity !