Why can't I select OK on the Android VPN dialog?

When Speedify is connecting on Android, it presents a VPN dialog for the user to give permission to start the VPN. 

You will see this dialog in Speedify

• The first time you run the Speedify app
• After you have rebooted the device
• After using a different VPN app

Some devices have a checkbox that says, "I trust this application." You must check the checkbox first before clicking OK.

If you cannot click OK or check the "I trust this application" checkbox, there might be another app on top of the dialog. Some known apps that can cause this are Lux Brightness, Night Mode, and Twilight.

To avoid this problem, close all apps that may be running in the background.