Hi Laura_____,
The first element to be aware of regarding an Apple One trial is outlined on the page Apple One:
"Do I get a free trial? And what does it include?
Any subscriptions you don’t already have are free for the first month of your Apple One subscription.* If you currently pay for any of the subscriptions, you will continue to be charged for them separately until the Apple One trial is done and you switch to a paid Apple One plan. After the free trial, the plan automatically renews as a monthly subscription."
From that it's important to note that if you had an Apple Music plan and enrolled in Apple One, your existing Apple Music subscription should not be changed and will automatically convert when the trial is up. If you cancel a subscription during the trial, access to that service may be impacted during the trial period.
Also from that article:
"Can I share with my family? How do I set it up?
If you have the Apple One Family or Premier plan, you can use Family Sharing to share all included Apple subscriptions with up to five other family members without the need to share your password (Family Sharing does not happen automatically; you’ll need to set it up)."
Make sure that the subscriptions are configured by the organizer or whoever subscribed to be shared with the rest of the group.
Regards.