Just found this thread after being quite confused and alarmed with how this all is setup. Got an IDnotify Email and the login link there is, as others have said here, the below.
https://sso.identitymanagementcenter.com/sp/startSSO.ping?PartnerIdpId=sso:imc:90000108
This link looks pretty shady, but sends you to the intuit site where you login with your TurboTax account. It then routes you back to IDnotify to a branded TurboTax page showing your alerts.
This all started as I received the IDnotify on an old Email address (now forwarding to another one) and wanted to change the Email. Called IDnotify and they required a creepy level of information to even look at my account and then were unable to access anything in their system. This raised a number of red flags for me which then led me to wondering about that strange login link.
After reading this thread, I'm thinking the login link is legit and hoping the IDnotify customer service rep was also. Either way, its a pretty bad implementation of this feature.
