Let's look at the actual rules, then what you have and did to get a final answer.
Rules:
- IRA accounts - you can pick one account to cover the RMD for each account
- 403b - same as IRA
- 401k- you must take the RMD from each account
- 457B - you must take the RMD from each account
You have "multiple retirement accounts" - if they are all IRA accounts, then you determine the RMD of each and can withdraw the funds all from one account or spread out among them- per person. If you have other investments, please reply back with more information, if you need further assistance.
Reference: Retirement plan and IRA required minimum distributions FAQs | Internal Revenue Service
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