You can check your subscriptions from the Office365 by logging in at https://www.office.com/

Once logged in, click on your avatar in the top right and select the 'View account' option.

This will take you to your account overview with a navigation pane on the left hand side.

The bottom option in the list will allow you to review Subscriptions on your account:

Scroll down to the bottom of the list, where you will see PowerBI Pro, should you have the license linked to your account:

For more information regarding PowerBI licenses, please visit:

https:/docs.microsoft.com/en-us/power-bi/consumer/end-user-license