After you changed the user information, it needs to wait up some time for your settings to take effect in desktop client.
If it is unchanged after a long time, you could clear the client cache and relog in Teams client to check if it shows properly.
Clear cache by deleting any file in the following 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
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