Hi Ann,
I'm Maciej, an Independent Advisor and expert on Microsoft products.
Sorry to know that some users are having this issue. Let me help you out!
To isolate the issue, please have them clear cache on teams app on their device.
Follow this steps:
1. Open Settings on your phone and select Storage.
2. Select Apps or Other apps on the following screen.
3. Scroll down and tap the Teams app.
4. Tap the Clear cache option.
I hope this helps, let me know if you need any further assistance,
Maciej
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