I'm getting the same message about getting a W-2c for uncollected SS and Medicare taxes. This seems to be related to taxes on company provided Group Universal Life Insurance (GUL) greater than $50K. The message is triggered by having items in Boxes 12 a-e, specifically Codes M and N.
For the tax year 2020, I also had items in these boxes, but did not receive the W-2c notification in TurboTax20.
I'm not sure if my employer is responsible for these taxes or if I am.
I have been retired 7 years, an employee, not an employer.
