I recently purchased Android full access license with birthday sale pricing (€29.99 ==> €12), and wanted to also make use of the birthday sale pricing for iOS. Website pricing page indicates both Android and iOS on sale for €12 (AUD $15 local currency).
When going to Cryptomator iOS ‘Unlock Full Version’, it looks as though the birthday sale price is not being honoured (Yearly $9.99; Lifetime License $39.99). Do I need to do something different on iOS (a new/unfamiliar device), to activate the birthday sale pricing?