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It seems that during a period of time the system keep the cache of the previous token and it doesn't allow to be refreshed.
해결 방안
We need to look for the cache files in the %Temp% folder - MNEUnifiedTokenCache.dat or - MNETokenCache.dat Make sure that you do a backup of the files or rename them to .old and then restart MNE and try to do the migration again.