I recently joined the beta for Item Bundling, and I thought it would be helpful to test some scenarios in the sandbox environment rather than having to do that in production. My use case also involves using the API with beta features.
But it does not seem to me that the beta system that allows approved customers to access beta features carries over into the sandbox environment.
Did the team mention that the feature would be available in sandbox and APIs? If its available they should’ve enabled you. I’d recommend reaching out to the team.