If you are saying that the original 2022 tax year return showed taxable income in relation to a 529 distribution which was used for educational expenses, no, you do not need to include a copy of your Form 1099-Q. The IRS already has their copy.
Yes, you would indicate for the reason you are amending something like "Taxed 1099-Q was used for education expenses, Room and Board" so the IRS will understand why you amended the return and that the expenses you are now claiming are not expenses you used towards a credit.
The TurboTax program can only use what you enter, so if the room and board expense was not entered, the program would not have applied those expenses to the distribution.
You should be able to E-file the amended return. You should not need to mail it, however if the E-file does not go through, mailing would be the next alternative.
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