Hey there Hassc,
Thanks for reaching out to Apple Support Communities. We understand that you're currently on a free trial of Apple One Premier, but you're unable to access News+. We're happy to provide some assistance.
Were you previously subscribed to News+ and canceled that subscription? As mentioned in Bundle Apple subscriptions with Apple One, "Apple One includes a free 1-month trial for services that you don’t already have. After your free trial, services that you previously subscribed to are automatically included in Apple One. If you recently canceled a service, you might not be eligible for the free trial. Your plan automatically renews after the trial."
If you continue to experience issues, please reach out to us here to investigate: Get Support
We hope this helps.
Have a great day!