These 2 answers have resolved the issue for me. Now I just have to wait for the IRS to send me paper copies of 1099-B, DIV, INT, and OID to send to ex-wife - because their pdf version cannot be scanned (but the hand-filled pre-printed one can, go figure)
https://ttlc.intuit.com/community/taxes/discussion/if-i-divorced-during-2019-but-have-a-1099-div-for...
https://ttlc.intuit.com/community/investments-and-rental-properties/discussion/how-do-i-issue-a-1099...
