I can't set the expiration date and access level 'company' in Shared link during the trial period of Starter plan.

I am in the trial period of the Starter plan.
I am trying to write a source code to add a shared link in node.js.

However, when I set the expiration date and throw a request to the API, the response is null as shown below.

"unshared_at": null

Also, when I throw a request to the API with the access level set to 'company', I get an error as follows

403: Forbidden

Is it possible to set these parameters during the trial period?
Or is there some other reason for this?

Thanks for your help!