Hoping this can help some!
Go in forms (top right menu), look down (left side) for w-2 (company's name), click on W2 form you want to look at and enter manually your SSN (xxx-xx-xxxx) in box a.
It looks like when W2 import or transfer to form is being done, it does not format the SSN correctly. I entered manually using standard format (xxx-xx-xxxx) and it fixed the error. Disclaimer: I can't guarantee it will fix error for all but it fixed mine:)
