Opus One uses an "Universal Subscription" allowing users to subscribe in one platform and being able to use the same subscription on the other platform, without purchasing another. Due to some technical restrictions, we made some important changes to the way we save and process this info.
1. Make sure you have Opus One for iOS and Opus One for Mac updated.
2. Make sure you are logged in to iCloud and that Opus One has permission to use it on all devices.
3. Try to remember where did you originally purchased your subscription, if for example it was on Opus One for Mac, you need to first activate that before activating the other Opus One on the other platform.