refreshToken is not returned with server side authentication

Hello,

I am creating a server side tool for automated box operation for my enterprise users, and using an authorized app with "OAuth 2.0 with Client Credentials Grant (Server Authentication)" method.

By following this document https://developer.box.com/guides/authentication/jwt/without-sdk/ -> "using a client id and client secret (Client Credentials Grant) - using a client id and client secret (Client Credentials Grant)", I succeeded to generate an access token, but the returned value doesn't contain a refresh token. Is there a way to get a refresh token besides of access token for server side authentication?

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