I would suggest chatting to your Office 365 admin, because if you have a Pro Trial you can create App Workspaces etc.
What I am thinking is that they gave you a Power BI Free license.
A way to check if you have a Power BI Free License is to create a Dashboard. And try and share the dashboard.
If you do the above and it prompts you to Upgrade, I am pretty confident that you have got a Power BI Free license.
Once you know that, you could then ask your Office 365 Admin to assign a Power BI Pro license to your account.
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