Okay Google verbal command not functioning

[BlindSurvivor]

Ever since my Samsung Galaxy S7 active received the push install of Google Assistant, my Google Now OK Google verbal command no longer functions. I can access it with the long home button push, but being blind, that does not help me very much. Even though shiny, and supposedly more advanced... I want my old Okay Google back. Are there any suggestion as to how to correct this issue? I had turned off the S Voice to no avail. Push install came during the update to Android 7. Any help would be appreciated. Thank you in advance and may God bless