Can not install Free Flight on a second device.

[Peio64270]

New owner of a second hand Anafi,, I have installed with success Free flight 6 (plus purchased add-ons) on my Samsung Galaxy Note 8.
I would like to install the app in a second device (a rooted Samsung Galaxy Tab S, Android 5.0.2)in order to benefit of a larger screen but installation fails at the very end with the message : "Registration has failed" (in French : "L'enregistrement a échoué").
What can I do ? Is this due to the Android version, to the tablet model or am I doing something wrong ?

Thanks in advance for your advices.

 

[AnafiPilot1]

I think FF6 does not work below Android 7, which might explain why it does not work on your Android 5 device.

 

[Peio64270]

I think FF6 does not work below Android 7, which might explain why it does not work on your Android 5 device.

I see. :-( Thank you very much for your answer.
Actually, I have installed the app without problem in an other device (Xiaomi Mi-Pad 3 8", Android 7) which was devoted to my DJI apps.