IBM Cloud AppID: Application role doesn't returns in JWT

Question

In my backend service, I require a token that contains the "roles" claim in the client credentials flow. So I've tried to setup App ID as described in the article about Assigning roles to an application, unfortunately, I didn't succeed in this.

Steps were done for setup:

1. Register the application with a "regular web application" type
2. Create a role
3. Assing role to the application like described in docs
4. Extend token config with "accessTokenClaims": [ { "source": "roles" } ]
5. Retrieve token for by Postman

Used parameters:

• URL: https://eu-de.appid.cloud.ibm.com/oauth/v4/{tenantid}/token
• Body: form data and form data encoded(tried both)
• grant type: client_credentials;
• Basic auth: username: client_id; password: client_secret

I also tried to use the body with form data and form data encoded(tried both)

• grant type: client_credentials;
• client_id: client_id
• client_secret: client_secret