Do you mean that you were required to take an RMD and the IRA provider failed to make that distribution? In that case you must complete the late RMD and file Form 5329 Part IX requesting a waiver of the excess-accumulation penalty. 2023 TurboTax will allow you to do this when in the 1099-R section you indicate that you did not complete all of the distributions you were required to make in 2023.
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If you are referring to RMDs, if an account owner fails to withdraw the full amount of the RMD by the due date, the amount not withdrawn is subject to a 50% excise tax. SECURE 2.0 Act drops the excise tax rate to 25%; possibly 10% if the RMD is timely corrected within two years. The account owner should file Form 5329, Additional Taxes on Qualified Plans (Including IRAs) and Other Tax-Favored Accounts, with their federal tax return for the year in which the full amount of the RMD was required, but not taken.
See full FAQ by the IRS: Required RMDs - IRS FAQ
But My Docs will not be attached to your tax return. If you efile you can't attach any extra documents or letters. Even if you mail your return they won't read or enter them either. @dmertz
I don't understand what is meant by, "My IRA provider mistakenly withdrew insuffient funds." Was there a distribution reported on a Form 1099-R? If so, what is the code in box 7 of the Form 1099-R?
Do you mean that you were required to take an RMD and the IRA provider failed to make that distribution? In that case you must complete the late RMD and file Form 5329 Part IX requesting a waiver of the excess-accumulation penalty. 2023 TurboTax will allow you to do this when in the 1099-R section you indicate that you did not complete all of the distributions you were required to make in 2023.