Prime Gaming Support
The Free Subscription with Prime Gaming subscription option only displays if:
You are subscribed to Prime Gaming,
the streamer is a Partnered or Affiliate channel, and
you haven't already claimed your monthly Twitch Channel Subscription in the past month.
Select Subscribe on the Channel page.
Select the Subscribe button with the Prime Gaming crown.
Note: Prime channel subscriptions do not auto-renew. Redeem your Prime Gaming subscription every month when you receive it to remain subscribed with one specific channel.