Unity facebook login popup not showing

Hi, I have used facebook login for authentication in my unity game.

it works fine in the editor but when i build the game and install the apk in my android mobile. upon clicking the button to open facebook login. the login pop up window does not open.

what could be the issue? Have you encountered anything like this? im using unityfb sdk 7.15.1 version.

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Having the same issue, found no solution, been 2 months trying to fix this thing. Did anyone find a fix?
Could possibly be something related to PlayFab-- not sure.