Can two different users subscribe from the same device?
Best answer by tina
Since the 2 app user IDs are using the same underlying app store account, RevenueCat will recognize that the receipt is already in use by another subscriber and throw this
Copying the resolution for visibility:
The user will either need to log in as the App User Id that already owns the receipt or restore purchases to re-sync the receipt with their current account. We recommend checking out the 'Transfer purchases' restore behavior.