The Plan Administrator is responsible for distributing the RMD (if one is required), so you can indicate that 'part of all of this distribution is RMD' and enter an amount that is equal to or less than the distribution amount. Neither the IRS or TurboTax knows what your RMD should be.
You could reach out to the plan administrator to verify this.
Here's more info on What is RMD?
@hmb96
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