You don't get a 1099R for investments. A 1099R is for IRA or 401k or pensions or annutites distributions or rollovers. Did you use the Online version or the Desktop download program for 2024? When did the IRS get it? They should adjust your return and send you a new bill or a refund for 2024. You might not need to amend.
How to amend a prior year Online or Desktop return,
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
If you used the Desktop program and don't have the data file or a backup ending in .tax2024, you will have to first recreate the original wrong return in the 2024 Desktop program. Then you can amend it.
