Not receiving refresh token when using authorization code grant with Postman

I had a quick question regarding the access token generation process.

I'm integrating with Lucid Chart’s OAuth 2.0 authentication and I'm using the Authorization Code grant type to obtain an access token. I'm setting this up using Postman's built-in OAuth 2.0 flow.

Everything works fine, I can successfully get an access token and use it for API calls. However, I’m not receiving a refresh token in the response, even though I expected one based on the standard OAuth 2.0 flow.

Here’s my setup:

• Grant Type: Authorization Code

• Auth Setup Tool: Postman

• Auth URL: https://lucid.app/oauth2/authorize

• Scopes: [e.g., teams etc.]

• Token URL: https://api.lucid.co/oauth2/token

• Client ID/Secret: Set correctly

• Callback URL: Configured and matches the app

Question:

Does this API support refresh tokens when using the Authorization Code grant type?
If so, are there specific scopes, client settings, or additional parameters required to receive one?

Any insights or examples would be appreciated!

Thanks in advance!