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.