Catastrophic complexity of signing in to office365 services

Question

I have been trying to log in to office 365 for several days in order to send an email with a delivery confirmation in the ERP application. Despite the fact that I have all valid identifiers such as tenant id, client id, client secret, user name, user password - I did not manage to get through to a valid authorization even during several days. The question is, how is it possible that despite having all valid and valid identifiers, I can't get authorized even after several days of suffering from constant errors from the msgraph service, and absolutely useless error messages? What kind of fool generates this type of "security by obscurity"? How is it possible that no one at Microsoft understands that when the user has all the necessary identifiers, he cannot have a problem with authorization and using the service? Why do you abuse and tyrannize users like this? I note that I am a developer with 10+ years of experience.