RMD's are the responsibility of the user. All IRA's are considered one as per IRS so regardless that you may have 3 brokers, you are ultimately responsible for calculating that you withdrew in total the correct amounts.
TT does not do this calculation but, the IRS has plenty of worksheets to help
https://www.irs.gov/retirement-plans/plan-participant-employee/retirement-topics-required-minimum-di...
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