Unable to Generate OAuth Token in Postman

Steps to Reproduce

Start the environment

docker compose up
./mvnw clean spring-boot:run -Dspring-boot.run.profiles=prod

Generate OAuth Token using Postman

Open Postman.

Create a new request with:

Method: GET
URL: http://localhost:8080/products/10

• Under the Authorization tab:

Type: OAuth 2.0

• Click Get New Access Token

Enter the following details:

Auth URL: http://localhost:8083/realms/specmatic/protocol/openid-connect/auth
Access Token URL: http://localhost:8083/realms/specmatic/protocol/openid-connect/token
Client ID: order-api
Client Secret:
Scope: profile email

Select Authorize using browser and click Get New Access Token.

In the browser, enter credentials:

Username: user1
Password: password

Click Sign In.

Actual Result

An error message appears instead of generating an access token.

Expected Result

An access token should be generated successfully.

The Use Token button should appear at the top-right in Postman.

System Information

MacOS: 26.1

Docker: 29.0.1

Chrome: 143.0.7499.41

Start by running docker compose up and ./mvnw clean spring-boot:run -Dspring-boot.run.profiles=prod, then reproduce the flow in Postman using the auth and token URLs listed in the issue. Trace the OAuth configuration involved in those endpoints; done means Postman generates an access token and shows the Use Token button.