Activate Public developer preview for Microsoft Teams in iOS or Android

Developer Preview is a public program for developers that provides early access to unreleased features in Microsoft Teams.

In Microsoft Teams , press Settings to activate the developer preview

On your Mobile teams application on top press the 3 bars then Settings.

Select Info from the settings menu

Press Info above Help & feedback.

Enable Preview-version for developers

In this screenshot, you can activate the preview version for developers. (Public developer)
Restart the Microsoft Teams application or restart your phone after this modification.

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