Error: "You don't have the necessary permission".

Since the previous owner did not properly prepare this Mac for sale, then you should perform a clean install which involves erasing the disk & reinstalling macOS. I highly recommend creating a bootable macOS Sequoia USB installer now while you still can since it can provide you with more options if Internet Recovery Mode causes you problems.

Here is what the previous owner should have done prior to selling the Mac.....you can only perform the steps starting at Step #6 which begins with erasing the disk & reinstalling macOS:

What to do before you sell, give away, trade in, or recycle your Mac - Apple Support

FYI, even if the previous owner has already done this, I still recommend people perform a clean install anyway just to make sure it is done correctly and because it may better reveal whether a previous owner is still managing the device. Plus if you've never done a clean install before, then what better time to learn than with a device that doesn't have your data on it yet. You definitely never want to use a device which still has the previous owner's custom setup & configurations.....who knows how messed up their configuration may be or what other nasty surprises may await you.

Predicated on " MBpro 2023 M2, Sequoia 15.5, 1TB storage, 32gb ram. " which is an Apple Silicon computer

Suggest being careful and Not attempt erasing the entire Physical Drive

Use this from the link provided by @HWTech

Use Erase All Content and Settings

Erase All Content and Settings makes it easier to reset your Mac to factory settings. Your Mac has this feature only if it’s using macOS Monterey 12 or later and is a Mac with Apple silicon or a Mac with the Apple T2 Security Chip.

• If your Mac has this feature, you can use it instead of following the other steps in this article. Learn how to use Erase All Content and Settings.

Let me add one more thing to the already good advised provided by my colleagues

On Apple Silicon Computers

There is a not so well documented or known issue of Ownership and Administrator Accounts

Normally the " Owner Account  " is the very first Account used when the Computer was Very First Setup as New and out of the box.

In the context of " Some of the previous owners "stuff" is still present, apparently. "

The Very First Account used to setup the computer ( Previous Owner " account would have the Ownership and Admin account

Below link will provide additional insights about the Difference between Admin Accounts and Owner Accounts  

https://eclecticlight.co/2021/07/18/last-week-on-my-mac-the-perils-of-m1-ownership/

You can have as many user accounts as you want and that is NOT a problem. Indeed every mac should have at minimum two admin accounts. I have seen many people whose normal account had problems which could have been easily fixed by logging in to a second admin account if one existed.

Is YOUR account an admin account or just a standard account?

What are you trying to install, and How, and Where?

Dont worry about too many admin accounts.