How to create a facebook business manager account?

How to create an account on Facebook business manager?

I had never had problems when registering on apps or internet websites, except for some difficulties that could be solved quickly. However, this time it is impossible for me to create a Facebook business manager account.
When I try with the company email it tells me that this account already exists, something that is not true, and when I try with a personal email, the result is a text that says: “An error has occurred when process this request. Please try again later ”. And this happens successively ...

Does any of this community know how I can fix the problem and register?

I must create campaigns on Instagram and without this previous step, the social network will not let me advertise my posts from.

I need help, urgently!

Someone to answer please ...