How to allow enterprise certificates to enable approved app installations

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If after taping on the app’s icon you see this message you need to ensure that your phone allows installation from unknown developers before you install/upgrade the TeleMessage app. Tap Cancel and continue following this section.

Open device Settings and tap

Tap Device Management’.

Tap the source of installation.
The source name might change according to your company preferred method of installation.

Tap Trust [‘installation source’].


Tap Trust.

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