Berlin Philharmonic- Digital Concert Hall - Free !

this excellent service now being offered free due to COVID19.
Its only free trial for 7 days though?
At least that’s what it says on Apple App Store for iPad.
@uber the notification I got was free - maybe only for prior subscriptions? 7 days hardly worth signing up.. but still good tunes
I signed up for 30 days on my Android using the voucher. But I don't know how to transfer it to my Fire TV using the app.