When you mean admin mode, are you able to get past the lock screen and go through the apps list? If there is a Samsung demo / retail app installed there are guides on here on how to remove those through the apps.
When a factory reset is attempted in recovery mode a message may pop up saying MDM profile blocked factory reset.
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Removing these kind of locks require either flashing via ODIN (if flashing is not blocked by MDM as well) or removing it through the installed apps.
When you mean admin mode, are you able to get past the lock screen and go through the apps list? If there is a Samsung demo / retail app installed there are guides on here on how to remove those through the apps.
When a factory reset is attempted in recovery mode a message may pop up saying MDM profile blocked factory reset.