This app “Body Temperature App for Fever” has no “Unsubscription” button.

Hello chalermsup,

Thanks for using the Apple Support Communities. We understand that you have questions about unsubscribing from a specific app. Looking over the screenshot you provided, it does appear the subscription has been cancelled and you have access to it until August 20, 2021. After this date, you would need to resubscribe to regain access. The reason you don't see a cancellation option is because it's already been cancelled.

This information is available in the article linked to your post, How to cancel a subscription from Apple, under section: How to cancel a subscription on your iPhone, iPad, or iPod touch #5.

If you still have questions or concerns, you can contact an Apple billing and accounts specialist at Get Support.

Best regards.

I have the same issue. Funny thing is that I don’t even have the app installed and I have never had it! How is this even possibile?