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Activate Google Assistant when screen is off?

I have a (Sprint) Samsung a50 and would like to know how to activate Google Assistant when the screen is off. I've searched through the settings but can't find anything. What steps or third party app can I use?
 
https://support.google.com/assistant/answer/7394306?hl=en&co=GENIE.Platform=Android

from the article:
Important: On phones running Android 8.0 and up, you can’t unlock your phone by saying "Ok Google." Instead, you can use the Google Assistant on your lock screen.
  1. On your Android phone or tablet running Android 5.0 and up, touch and hold the Home button or say "Ok Google."
  2. In the bottom right, tap
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    .
  3. In the top right, tap your profile picture or initial
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    Settings
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    Assistant.
  4. Under "Assistant devices," select your phone or tablet.
  5. Make sure Google Assistant and Access with Voice Match are turned on.
  6. Turn on Unlock with Voice Match.
 
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