Make sure you’re signed in with the correct account. 

Business accounts can acquire one of these license plans:

Business Basic

Business Standard

Business Premium

Microsoft Teams Enterprise or Microsoft Teams Enterprise EEA

Education accounts need one of these plans:

Microsoft 365 A1, A1 Plus, A5, or A3 (if you purchased E3 prior to its retirement)

US Government accounts need one of these plans:

Microsoft 365 Government G1, G3, G5 (Learn more about Microsoft 365 Government plans.)

If you’re signed in to the right business, school, or government account, your company's IT administrator might need to give you access to Microsoft Teams. IT administrators might also need to configure some options, such as updating firewall policies, so you can fully use Microsoft Teams.

Note: Microsoft Teams is off by default for Microsoft 365 A1 suite users, but your admin can turn it on. 

If you’re licensed for a non-suite plan like Skype for Business Online Plan 2, talk to your IT admin about changing your license or purchasing additional licenses for your company. After you have the right plan, your IT admin will need to make some changes for full functionality.