Morgan Stanley Smith Barney (Benefit Access) is not available.
Prior posts from Mint state that there is no workaround to this issue (and are closed to comments), but this just isn't acceptable. This gap has persisted for years now. This is critical functionality to many people with RSUs and ESPP!
A possible (still clunky) workaround would be for users to manually enter their stock symbol and number of shares held (and update over time with vesting/grants) - Mint could then display the current value using the current share price.