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I'm having a similar issue but my  line 4b from my 1040 has an amount in it.  If I'm understanding correctly, this is the 1/3 of my distribution.  Where do I put this?  If I go to the 1099-R section like the program is telling me to I'm not sure how to file it out?  I also did not receive a 1099-R for 2021.  Help please.