When we create a new Tenant ID, there will be a new environment type option enabled for Tenant Admin “Trail(subscription Base”)

Referring to Microsoft Blog: https://docs.microsoft.com/en-us/power-platform/admin/trial-environments

We get to know the difference

• Trial (standard): This is the trial type that organizations usually rollout to allow users and department managers to try new features and quickly build low-code and no-code applications and processes. Organization (tenant) admins can enable all users to create trials or only organization admins. If allowed for users, then any user from that organization, with a suitable license, can create a 30-day trial environment. After 30 days, the environment is disabled and deleted.
• Trial (subscription-based): This is the trial type that organizations can use to develop larger, multi-user and multi-department solutions and do proof of concept reviews. Tenant admins can add a trial (subscription-based) to their tenant or new customers can sign up for a new tenant and become the Global admin. For new customers, an admin-managed subscription is created with a set number of licenses (usually 25 licenses); admins control license assignment to other users. An admin-managed subscription has a start and end date that can be extended.

• Navigate to https://admin.powerplatform.microsoft.com/environments
• Create a new Environment and Select Trail (subscription Based) as type
• Create Database will be default checked

• Select Dynamics apps

• once done, you will find, customer engagement plain subscription in the admin. Microsoft.com