Hi, Sarah. I am an independent advisor, trying to help other users in the Community with my experience in Microsoft products. Please note that I am a user like you and don't work directly for Microsoft.
I am sorry you are experiencing this problem with Teams. I will try to help.
Do you experience the same problem with GIFs when you use the web version?
Now, I do not know what troubleshooting steps you have employed thus far, but I would suggest trying the following:
"Quit the Teams app completely and then reopen it.
Please ensure that your internet connectivity is stable.
Allow Fun Stuff from Manage Team Settings
You’ll find a Fun Stuff option in the Manage Team settings. That’s the place from where a team admin can disable the Giphy, stickers, memes, and custom memes. So, if the emojis or GIFs get stuck in the loading state, ask the team owner to allow or enable those features.
Here are the steps to enable or allow Fun stuff from Manage Team settings:
Go to Teams and select the three dots on the specific team.
Choose Manage team from the list.
click-manage-teams
Select Settings > Fun stuff.
Tick all the boxes for:
Giphy
Stickers and memes
Custom memes
Now, try sending an emoji or GIF from the chat box. I hope enabling those options will resolve the issue.
Clear Teams Cache
If Teams is still running, right-click the Teams icon in the taskbar, and then select Quit.
Open the Run dialog box by pressing the Windows logo key + R
In the Run dialog box, copy/paste:
C:\Users%username%\AppData\Local\Packages\MSTeams_8wekyb3d8bbwe
Delete all files and folders in the directory.
Restart Teams.
You can also try to sign out and back in"
https://10scopes.com/microsoft-teams-not-showing-gifs/
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Understand that I am an independent advisor and only trying to assist in the best possible way. Kindly let me know if the possible solutions provided help and if you need any other assistance, I will be more than happy to help further.
Regards
Femi