You can change the photo in Teams client directly as below:
- click your current picture at the top right of the screen and then click the camera icon that appears when you hover over your profile picture.
- From the menu that appears, click Upload picture to access your photos.
Besides, if the photo still show as the old one, it is recommended you to quit Microsoft Teams and clear your client cache by deleting any files in these folders:
- %appdata%\Microsoft\teams\application cache\cache
- %appdata%\Microsoft\teams\blob_storage
- %appdata%\Microsoft\teams\Cache
- %appdata%\Microsoft\teams\databases
- %appdata%\Microsoft\teams\GPUcache
- %appdata%\Microsoft\teams\IndexedDB
- %appdata%\Microsoft\teams\Local Storage
- %appdata%\Microsoft\teams\tmp
Then, open Microsoft Teams and try again.
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