Hi!
The issue here is that you are using the management API. It is not possible to get refresh tokens for the Management API, so therefore there is no “Offline Access” to enable in the settings. You will instead need to create a new token each time, which can be done programmatically by following the steps here: Get Management API Access Tokens for Production
Other APIs have refresh tokens / enable Offline access, but the management API does not because it only support client credentials grant.