Many people who have law degrees but who do not intend to continue practicing law deactivate their licenses rather than risk losing it for being in arrears.
Michelle Obama opted for inactive status and Barack Obama opted for retired status.
She could reactivate whenever she wants, but he would have to reapply for licensing. Which implies that she thought she might work as a lawyer again one day, while his action implies that he felt he was done with lawyering.
Neither "voluntarily surrendered" their licenses.
Are you just making this up?
If it was as simple as that Obambi would have release that info long ago
Are you stating factual information? If soe where did you get this info?
or are you just assuming that is what they did?