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
I understand my responsibility to sum the total of all separate RMDs, but the TT software has a glitch on one of the forms and it continues to say words to the effect "we are working on it" because it cannot sum the three separate taxable amounts. The problem persists so I am going to print my return per TT instructions and file by mail. I cannot e-file because of the TT internal issue. But thanks for the reply. v/r, JohnnyB