Can’t get the Authorization Code : The client id supplied is invalid

Hello,

I have created my client, checked the “Authorisation code” as allowed grant type (I use the free version, I only can select this one).

In settings, the “Enable OAuth Server” is checked.

So, to get the authorization code, according to the doc : https://wp-oauth.com/docs/general/grant-types/authorization-code/

I do this get request in my browser : https://www.mysite.com/oauth/authorize/?client_id=XXXXX&response_type=code

But I got : {“error”:”invalid_client”,”error_description”:”The client id supplied is invalid”}