The QT from here would too: https://forums.mydigitallife.net/threads/multi-oem-retail-project-mrp-mk3.71555/#post-1283849
Yeah, the slmgr shows end of currently used product key and it's the same as what it was while updating from windows 10. which is really odd as from vista->7->8/8.1->10 every version of windows has so far after upgrade have it's own product key, but windows 11 again seems to be using same as what was used with windows 10. No sure, if that's correct, but going to wipe one laptop clean and test, if same product key will still activate windows 11, if not then there is own product key.