GREAT NEWS: Nitrokey Pro is supported by OpenKeyChain on Android now!

Thank you, this nearly worked for me, I have Motorola Moto G3 - Nitrokey Storage - USB OTG Cable. Unfortionally the Power Supply of the phone does not seem to be enough to power the Nitrokey Storage, so this setup only works for me with a powered USB hub. I opened a new Thread at Nitrokey Storage and Open Keychain => Lack of power supply? to see if someone has an Idea to fix that.