Organizing and updating events, classes, and meetings within the Teams calendar
Hello Sai Raju,
Thanks for your post in Microsoft Community.
Regarding to the problem that the calendar tab is missing, there is a chance that someone changed the related policy. To check it, please contact Office 365 administrator to go to Microsoft Teams admin center and then follow the steps below:
1. Sign into Microsoft Teams admin center as an Office 365 administrator.
2. Click Users in the left pane and then select your account.
3. In your account information page, click Policy and select the policy under App setup policy.
4. In Pinned apps section, please check whether Calendar is in the list. If not, click Add apps to add Calendar into the list.
If the issue still persists, please provide the following information to me for further assistance:
- Please confirm with other users whether they encountered the same problem.
2. Please provide the screenshot of this issue to me.
3. Whether the Calendar shows up in Teams Web App?
4. Since you mentioned that you got license error when sign into Outlook Web App, please try this link in InPrivate/incognito mode and check whether you can sign in: https://outlook.office365.com. If you still get error, please share the screenshot of the error with me and I will do my best to help you.
Regards,
Seven