As with all accounts, you will be locked out once a person is deceased, so it is understandable that you couldn't get into your mom's account once the funeral home notified Social Security as with a bank account once they know of the death. With you being the Fiduciary having to file the final tax return for your mother, you need to be persistent with the Social Security office telling them this situation. In the end, they should understand since my husband too had to deal with this. I understand they never want to talk to anyone else besides the person / your mother - but now they have no choice, so just tell them you / your mom, did not receive her 1099.
