Duo Yearly doesn't cancel your partner's own subscription automatically. Your partner needs to cancel it in Google Play or the App Store to avoid paying twice.
3 steps · about 1 min
Steps
1
Tap "24h Pro" in "Me" or open the Duo Yearly screen. If you see "Your Yearly Pro comes from your partner's Duo Yearly. Cancel your own subscription in Google Play / the App Store to avoid paying twice", you still have your own subscription.
Screenshot comingReminder on the Pro screen
2
Tap "Manage Subscription" on the Pro screen to open the store's subscriptions page.
Choose 24h and tap "Cancel subscription". On Android you can also go to Google Play › your profile picture › "Payments & subscriptions" › "Subscriptions"; on iPhone, go to Settings › your name › "Subscriptions".
Screenshot comingStore subscriptions page
24h won't cancel it for you. After you cancel, your own subscription lasts until the end of the current period, and then your partner's Duo Yearly keeps giving you Yearly Pro.
When the payer chooses you, they also see "Your partner still has their own subscription. Remind them to cancel it in the store."
If Duo Yearly ends later (for example, the payer turns off auto-renew or you're no longer Close Ones), you'll go back to the free plan and can subscribe on your own again.