Canceled GoodNotes Plan on Android But Can’t Resubscribe on iPad

I canceled my GoodNotes subscription purchased through Android (Google Play), but since the subscription period hasn’t expired yet, I can’t buy a new subscription on my new iPad using the same email address. I tried canceling it again through the Play Store, but it doesn’t work — it says it’s already canceled.

Do I really have to wait until the current subscription period fully ends before I can start a new one on my iPad? That makes no sense. I just want to use my subscription properly on my new device without waiting. Please provide a solution to this issue.