Missing or invalid consumer key - Sending Grades from External LTI system to Moodle 3.9

Hello,

I am currently developing a flashcard application using python-django on my local server. I can launch it from moodle as an external tools 'Tool Provider (TP) of Learning Tools Interoperability (LTI) version 1.1', I want to pass grades and custom values ​​from TP back to Moodle LMS version 3.9.

When I launch my application from moodle, it shows into Moodle as an embedded website: it works.

Now, I want my tool send a grade to Moodle.

For this, I used postman , but I get this authentication or token error:

V1.0422950278failurestatusMissing or invalid consumer key or access token.unknownRequest

Please see below how I have setted up Postman and Moodle.

Thx you!