How to synch litchi license on DJI Crystal Sky without Amazon app

From time to time the litchi app on my DJI Crystal Sky requires a renewal/synchronization via the Amazon app, which is also installed on the device. Now that the Amazon app is no longer supported due to the outdated version of Android on the device, how can I perform the renewal/synch in the future?

Anyone having the same problem?
Thanks a lot for your help.