When you try to create a meeting in Planner, you get this error message:
You do not posses the required information to complete the meeting. To resolve this issue, please contact the system administrator.
(It might have different formatting in other browsers.)
The problem is that you are not connected to either a meeting type or billing account. Meeting type and billing account are granted through your Planner department. Please ask your administrator to check that your Planner user has a Planner department which contains a meeting type and billing account.
See this guide on how to connect users, departments, billing accounts and meeting types https://helpdesk.pronestor.com/hc/en-us/articles/360028128652