If you look at your Form 1040, is the box checked next to Line 7 that says "If not required check here?" That is likely why it was not generated. If the IRS is requiring a Form Schedule D, you can use these links below.
There are two exceptions to requiring a Form Schedule D when you report an amount in Box 2a of Form 1099-DIV. If you meet Exception 1 or 2 you are not required to file a Form Schedule D. If you believe you meet one of these exceptions, you should call the IRS to discuss your situation. There should be a phone number on the IRS Notice you received.
They are as follows:
If you sold a capital asset, such as a stock or bond, you must complete and attach Form 8949 and Schedule D.
Exception 1.
You don’t have to file Form 8949 or Schedule D if you aren’t deferring any capital gain by investing in a qualified opportunity fund and both of the following apply.
You have no capital losses, and your only capital gains are capital gain distributions from Form(s) 1099-DIV, box 2a (or substitute statements); and
None of the Form(s) 1099-DIV (or substitute statements) have an amount in box 2b (unrecaptured section 1250 gain), box 2c (section 1202 gain), or box 2d (collectibles (28%) gain).
Exception 2.
You must file Schedule D but generally don’t have to file Form 8949 if Exception 1 doesn't apply, you aren’t deferring any capital gain by investing in a qualified opportunity fund or terminating deferral from an investment in a qualified opportunity fund, and your only capital gains and losses are:
Capital gain distributions;
A capital loss carryover from 2023;
A gain from Form 2439 or 6252 or Part I of Form 4797;
A gain or loss from Form 4684, 6781, or 8824;
A gain or loss from a partnership, S corporation, estate, or trust; or
Gains and losses from transactions for which you received a Form 1099-B (or substitute statement) that shows basis was reported to the IRS, the QOF box in box 3 isn’t checked, and you don’t need to make any adjustments in column (g) of Form 8949 or enter any codes in column (f) of Form 8949.
If Exception 1 applies, enter your total capital gain distributions (from box 2a of Form(s) 1099-DIV) on line 7 and check the box on that line. If you received capital gain distributions as a nominee (that is, they were paid to you but actually belong to someone else), report on line 7 only the amount that belongs to you. Include a statement showing the full amount you received and the amount you received as a nominee. See the Schedule B instructions for filing requirements for Forms 1099-DIV and 1096.
Click here for Form Schedule D.
Click here for Instructions to Form Schedule D.