Licence error in android app

Hello, I bought Cryptomator on the Cryptomator website and downloaded the APK. I received a key by email. When I transfer the key into the program, a red message appears. The email contains a link (as far as I understand, it’s the second activation option), but when I click it, nothing happens.

Hey and welcome to the Cryptomator Community :slightly_smiling_face:,

Can you please send me in a direct message your license key? Or send an email with it to support@cryptomator.org

Thank you!