Why is the missing form parameter: grant_type response received on OAuth authorization?

Question

OAuth

I deal with authorizations through OAuth, for some reason, after receiving the code, I can’t exchange it for a token, the missing form parameter: grant_type error is returned. What am I doing wrong?
Attached is a photo of the request from Postman

Answer 1

As an answer - no idea why, but curl with the same parameters works fine. I sin on a postman glitch.