Recently, while using the paid-for (via Apple App Store, USA) FlightView Plus App I receive the following error message for each and every flight added to a given trip "Unable to Enable
Notification. Could not turn on notifications for [AIRLINE & FLIGHT NUMBER]. Please try again later."

Interestingly FlightView Plus is - according to Apple App Store, USA - "no longer available in my country" (or some similar language).

Any thoughts on this error and what I may be doing wrong. Apple has done a tremendous job of confusing me more and more with the various notification options available for lock screen and unlocked notifications. So, perhaps I've done something wrong there with a knock on effect in FlightView Plus.

And I'm aware that FlightView Plus is now owned by OAG. Is that error message pushing me towards a paid/subscription model for notifications?