Once you have linked the two accounts, you will be able to claim an initial free three month trial of Nintendo Switch Online (presumably this will work with the free seven-day trial of Twitch Prime). After 60 days, they can come back to get another nine months of Nintendo Switch Online, for a total of 12 months. (Family Memberships can't add on the time.) Also, people with accounts in participating Nintendo Switch Online regions are the only ones who can claim this offer.
Hey Nintendo fans! Now you can get up to 12 months of Nintendo Switch Online with #TwitchPrime!
Don't worry, although you do have to sign up for a shorter subscription initially, you'll be eligible for another nine-months for zero cost at all, according to RedFlagDeals! Amazon Prime members and Prime Video subscribers can become Twitch Prime members by linking their accounts on Twitch. You will need to log in to your Twitch account. Finally, you'll be able to redeem your Nintendo Switch Online membership on your Nintendo Switch.
If you already use Amazon Prime, this is an easy freebie for you.
This offer will no longer be available to claim after September 24, 2019.
Is this an offer you would be interested in? Just to be safe, once you've gone through all the steps, you can visit this page at Nintendo to turn off auto-renew.
This will hopefully strengthen the numbers of Online Service subscribers for Nintendo, while also making the service more reasonable of a purchase for fans. The Nintendo Account User Agreement, including the Purchase and Subscription terms, apply. This deal is flawless for those already paying for Amazon Prime, though.