Sorry, but I don’t understand your question at all. Why do you have a 1099-R, what was the distribution?
If you have a deemed distribution because you left your employer with an outstanding 401(k) loan, that is one procedure. If the 401(k) administrator closed your account involuntarily and sent you all the remaining funds, that is a different set of rules. (In particular, you had 60 days to roll over the funds into a private IRA or into a different workplace plan. If you didn’t, I think the money is still taxable to you with a penalty. Even if the withdrawal was involuntary, you had the option of rolling it over.)
