Once support for Windows 10 native notifications is released, users who choose to use Windows notifications will be able to utilize Windows OS specific settings for the length of time to display notifications. Mac does not have an OS specific setting, so will not have the support.
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It would be useful if on the iOS app you could choose any notification sound rather than being restricted to the app ones. Our production staff work in a noisy environment and since switching to teams for group chat/call keep missing them