Hello there, this link should help with activating Bixby on your device.
Be sure to click " ✓ Accept as Solution" when you find an answer that works for you.
Please note, notification emails are a DO NOT REPLY address, you must log-in on the community page in order to respond.
Bixby voice isn't available for the A20. Just Bixby home which you already have. Bixby voice is embedded in the firmware and isn't downloaded.