If the tax did not change, you may not need to amend the return.
An amended return (1040X) is only required if you owe tax from the change.
You should wait until your original return has been processed by the IRS.
The IRS may have already considered the missing 1099-R and accounted for it.
Please make sure the 1040X shows that no tax is due.
If no tax is due, I suggest you do not try to file a 1040X
If you insist on trying to e-file the 1040X, I suggest you fill out the 8888 and see if you can continue in the TurboTax program.
IRS Topic 308
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