@Shelley912, if you have multiple Roku devices, it's possible that you have multiple Roku accounts. Check the email address that's displayed under Settings->System->About on each one. If you ever gave away, sold, or returned a Roku device, it's also possible that you have an account you forgot about that's now being used by someone else. If you have multiple Roku accounts, you'll have to check the subscriptions for each of them at https://my.roku.com.
If you're using the Discovery+ app and not accessing it through The Roku Channel (I honestly don't know how those subscriptions work), you should be able to manage the subscription by highlighting its icon on your Home Screen and pressing the * button on your remote.
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