Custom background option is not showing.

[TheEarthIsFlat]

I am using my school laptop, all my classmates have it, everyone has the exact same laptop, yet I don't. How can I fix this? Please help me.

[#2]

@TheEarthIsFlat 

Check to see if you have the same version of Teams as your classmates.  You can do this from Teams by clicking your profile at the top right, then choosing About | Version.  

If your version differs, this could be the issue and you can try updating.

[#3]

@TheEarthIsFlatI would suggest checking the Teams Version it could be different than other users, besides check on the windows updates...

besides here is the manual way of setting up your custom background if the add new option is not showing...

To manually delete or add virtual backgrounds in Teams:

1. Launch the File Explorer in Windows and add this location in the address/URL bar and press [Enter]:
   %APPDATA%\Microsoft\Teams\Backgrounds
2. From here, you will see the pre-set backgrounds that you have worked with before in Teams. The Uploads folder is where you have your custom virtual backgrounds. So if you got a little bit excited about this option to add your own images and now you’ve changed your mind, you can remove them from the list that displays in the Teams Background settings.
3. To delete the images you no longer want to work with, open the Uploads folder. Select and delete the images you don’t need. You can also copy in images to this folder as an alternative step for adding custom backgrounds.
4. Close File Explorer when you’re done.

[#4]

@TheEarthIsFlat Hi are you joining the Teams meeting via the Teams desktop app or via the web browser?

The custom and blurred background are only available if you use the Teams desktop app in Windows or Mac or via iOS on a mobile.

If you join the meeting another way them it is not available. Please see link for the Team meeting features by platform Meetings and live events - Office Support (microsoft.com)