There are several Microsoft 365 for business plans that you or your organization can choose from when you sign up for one of Microsoft's cloud services. After your organization signs up for Microsoft 365, the admin can assign different Microsoft 365 licenses to each user account. Licenses can be for apps such as the latest desktop Office apps, or services such as SharePoint in Microsoft 365 and OneDrive for work or school. See the different Office 365 for business plans.
If you experience a problem in Microsoft 365 – for example, you can’t use or install Office on a device – it could be that you don’t have the necessary license that enables that service or you don't have a subscription that includes the desktop applications which require installation. To fix this, you can contact your admin or IT staff for help, or if you're the admin, you can add the license yourself.
For full details about how to check what licenses you have, read this article in a web browser.
Note: This topic is for Microsoft 365 for business. If you have an Office for home product and want to see what Office for home products you have a license for, sign in with your Microsoft account to Services and subscriptions.