Roth IRA Distribution

I received a total distribution from my Roth IRA.  Box 2A is blank; Box 2B Taxable Amount Not Determined and Total Distribution is checked. Box 7 (distribution code) is "T Roth Distribution, Exception Applies".

I am over 591/2, have had the Roth for well over 5 years.  This should be non-taxable, is that correct?  How do I assure it is non-taxable and what form is that reported on?

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