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Da prompt admin:

net stop sppsvc
del C:\Windows\System32\spp\tokens\tokens.dat
net start sppsvc

Poi attendi 10-15 secondi e riprova il comando DISM:

DISM /online /Set-Edition:ServerStandard /ProductKey:NM6VM-VPD92-JC2G8-Q72C6-PDPH3 /AcceptEula