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The auth.User model is already registered in the django admin that’s why you see the error. To avoid it you have two options:
A. Unregister the User admin and then register it again as a VersionAdmin: Something like this:
from django.contrib import admin
from django.contrib.auth.models import User
from reversion.admin import VersionAdmin
admin.site.unregister(User)
admin.site.register(User, VersionAdmin)
B. Use the registration API of django-reversion (https://django-reversion.readthedocs.io/en/stable/api.html#registration-api) to register the model without modifying your admin, for example:
import reversion
from django.contrib.auth.models import User
reversion.register(User)
Source:stackexchange.com