It appears that it's not that my username changed, but it automatically logged into a "mint turbotax". https://ttlc.intuit.com/questions/3752270-why-did-my-turbotax-information-disappear-after-i-logged-i... A very unhelpful feature as people may want to use both at the same time (and keep the separate for security), but it appears it is the current state of things.
