Building, integrating, or customizing apps and workflows within Microsoft Teams using developer tools and APIs
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Based on your description, I understand that some Microsoft Teams users are reporting the absence of the "three dots" typing indicator when someone else is actively typing in a chat
As far as I know this issue can be caused by Deactivating "Animation Effects" function in Windows, so to addressing this issue, you can configure this setting by the instruction:
You can find it within Settings -> Accessibility -> Visual Effects -> Animation effects -->Activated. The following screenshot shows this setting:
Hope my answer will help you, if the issue still persists, let me know in the comment section
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