I haven't seen other threads about issues with entering Social Security. do you have all updates. if so, try contacting support because it's unclear as to exactly what the problem is or what may be causing it. If you override, you will not be able to e-file. and Tubotax's accuracy guarantee is void.
5am-5pm Pacific Time (8-8 Eastern) Monday - Friday
https://support.turbotax.intuit.com/contact
800-446-8848
