Hi @alex.pravdin,
Welcome to the Auth0 Community!
I messaged one of our sales team in regards to your request. They will likely reach next week due to the weekend.
In the meantime, let me see if I can answer any of your questions.
This post does a good job of explaining the difference: In our pricing, what is the difference between internal and external users? Are they different technically?
tl:dr MAUs are users who have authenticated within the month. External are non-employee users.
I don’t see why not. There is no Entity Limit Policy for users, and they shouldn’t count towards your monthly if they aren’t authenticating (assuming you are doing a batch import).