2FA setup?

I’m trying to setup 2FA: after enabling it, I use the code that is provided under the QR-code but keep getting this error.

> After scanning the code, enter the six digit code from your app to verify the setup. If you have problems scanning the QR code, do a manual setup with code.
Invalid code, please try again. If you get this error consistently, please make sure the clock of your Home Assistant system is accurate.

The time of my system is correct:
> Sat Oct 31 11:38:03 CET 2020

EDIT: I’m trying this on an Android tablet without the play store.
So whether using Authy or ggl authenthicator, it seems both rely on the ggl ecosystem, right?
Is setting this up possible without a mobile phone/number?