GOOGLE PLAY PROTECT” when I am trying to install any custom apk with screenshot

Hello,

I am getting a dialog box with title “GOOGLE PLAY PROTECT” when I am trying to install any custom apk in my Sony Android TV. It is showing me “ALLOW” and “REJECT” button. But both “ALLOW” and “REJECT” button are not clicking
Menu > Settings > Security > and check Unknown Sources is already enabled.

My TV was upgraded to latest version a few days ago

I have tried installing using ESExplorer and browser both

MODEL: KD-65X9000
See attached screenshot

Any suggestion?

Thanks