Glad to help. First the amount you are getting from your former husband is alimony. You should enter that amount in the "Alimony Received" topic under the "Wages & Income" tab in the "Less Common Income" section.
Next, the IRS is behind on processing 2019 tax returns. Even after processing, the systems are not getting updated quickly all due to the Pandemic shutdown and delays in 2020. Eventually, everything will catch up.
Finally, you say you received an SSI payment "for" the last month of 2020. When did you actually receive it? I assume in 2021. If that is the case, you will get a 1099 next year to use for your 2021 taxes.
If you wish to verify that no 1099 has been issued to you, you can request a Wage & Income transcript from the IRS using this link that will show what income has been reported under your social security number. If there is one there you can use that information to file your 2020 return.
Also, note that some or none of your SSI may be taxable depending on your total gross income. Generally, if 1/2 of your social security income when added to the rest of your income totals less than $25,000 then none of your SSI will be taxable. TurboTax will do all the calculations for you as you enter your income sources.
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