Billing settings
A tour of the billing page.
Billing (sidebar user menu) is where the money side of the account lives. It reads top to bottom, and nothing on it is a form — every block acts on its own.
Staff who open it see the honest refusal instead: "No access to billing — Billing and subscription details are managed by the business owner. Ask them if you need a change to the plan or the payment method." That is by design; billing facts are the Administrator's alone.

How plans work · Seats & add-ons · Payment & the customer portal