Good luck with Intuit!  I have complained over and over and they don't care!  The problem is the email associated with the client, you are correct!  But rather than use the information in your tax data file when you invite the client to Link Intuit overrides what you put in and goes back to that original contact data INCLUDING the phone number!  In my case the client could have accepted Link but they do not have that old phone number anymore.  This is a huge waste of my time to have to fix this issue once again!!!!