I have successfully got the access_token and the refresh_token from a Web Flow OAuth2. My scope do include full and refresh_token.
The issue I have now is that when I login after with server to server API communication, I can use the refresh_token to get a new access_token when I POST to /services/oauth2/token and I do get a response from Salesforce. The problem is that in the return response there is no refresh_token returned from /services/oauth2/token.
Has anyone run into this issue to get refresh_token from /services/oauth2/token?