Laravel Passport Login with Password Grant Token

I'm working on Laravel boilerplate using Laravel Passport as the Oauth and looking for an expert to create the login functionality and pass the token to the client using the code at the link below or something similar (I use email as the username): [login to view URL] I tried the code on that link but keep getting the error below when using Postman/Insomnia: { "error": "unsupported_grant_type", "error_description": "The authorization grant type is not supported by the authorization server.", "hint": "Check that all required parameters have been provided", "message": "The authorization grant type is not supported by the authorization server." } I already created the Register controller, just looking for someone to take care of the Login. I would prefer to use the code on that link but if you can provide something different that will still hide the client ID and secret it would work also (like a proxy). But please, no Guzzle, it can cause issues when performing internal requests (I spend two days trying to get Guzzle to work). My main purpose is to hide the client and secret instead of putting them in the client. Please note that the Password Grant is to be used for First-Party application but I am also using Passport to authenticate third-party clients, such as mobile apps. Please nothing overly complicated, I'm looking for something simple, yet effective. Requirements: Must be experienced with Laravel Passport and OAuth 2, must be able to complete work in a timely manner (is just one controller and I'm already providing you most of the code). If you know Laravel this is the easiest cash you'll ever make. Let me know.