Expert advice needed

I'm a programmer, registering fb in bulk via fingerprint browser + multi-IP + email, and found that after registering dozens of numbers an error occurs, I hope someone will guide me on the problem here.

As a programmer you don't seem to be able to do this much.
This requires a lot of experience, not programming ability. You should collaborate with someone who has a lot of experience, similar languages. because it cannot be changed through some advice here .
However I will give you a few basics in this for your attention.
First: user agent.
Monday: fake ip
Third: browser (Chrome, phone farm, etc.)
If you solve these 3 problems, you basically have a way to create thousands of accounts every day.
Good luck

This is so hard to explain bruh, AI of Facebook is intelligent alot now

i used to have the same problem and FB is getting smarter and smarter. they won't let you spam too much on one ip even if you use mutillogin . please use Proxy or VPS in bulk and create a certain number of profiles in the long run. Don't try to do everything the fastest, do everything the most carefully