I have also had similar problems with clients accessing Intuit Link (email address not found, etc.). It is important for everyone who has the same problems to PLEASE UP-VOTE this post (and mine, https://accountants.intuit.com/community/proconnect-tax-idea-exchange/intuit-link-client-email-not-f... ) so that the development team will actually pay attention to this issue and hopefully work to resolve it.