Hi,
This license Dynamics 365 P1 Trial for Information Workers is a trial license and automatically assigned to the users when they are added to a Trial Dynamics Instance its added to your tenant when you create a Dynamics 365 CRM trial instance from https://trials.dynamics.com/.

Customer Engagement Applications Trials
You can sign-up for a free 30-day trial:
• Sales: dynamics.microsoft.com/.../
• Customer Service: dynamics.microsoft.com/.../
• Field Service: dynamics.microsoft.com/.../
• Marketing: dynamics.microsoft.com/.../
Finance, Supply Chain Management, Commerce, and Human Resources Trials
You can sign-up for a free 30-day trial:
• Finance: dynamics.microsoft.com/.../
• Supply Chain Management: dynamics.microsoft.com/.../
• Commerce: dynamics.microsoft.com/.../
• Human Resources: dynamics.microsoft.com/.../
Note: At any time during your trial you can activate your subscription and keep your data and customizations.
Support included for Trial is the same as what customers receive when purchasing Dynamics 365 services.
Premium level support options are not available for purchase during the trial period.
You can only have 5 trials instance at a time under your tenant, 5 users per organization in a max total of 25 users.