1. You mentioned that you get the alimony from his pension and reported it as a pension, but called it alimony.
This may explain the confusion at the IRS for your situation. Unless you receive Form 1099-R, it must not be reported as a pension even though it is coming from his pension.
Sending the divorce decree may not be enough if you reported the alimony in the pension section. You may need to amend the prior year to remove the pension reporting.
See: How do I amend a 2019 return in TurboTax?
2. Please contact Social Security to get your Form SSA-1099 or go online. See: Get a copy of your Social Security 1099 (SSA-1099) tax form online
