You do not need to install Amazon Underground app.
I had no problem to install and use the v8.5.2 version.
Below is what v8.5.2 and v5.6.1 check
As you can see not much differences:
v852
read_contacts
com.android.vending.check_license
com.android.vending.billing
internet
access_fine_location
wake_lock
access_network_state
write_external_storage
write_settings
camera
location
vibrate
flashlight
access_wifi_state
change_wifi_state
get_tasks
modify_audio_settings
bluetooth_admin
bluetooth
broadcast_sticky
access_coarse_location
nfc
com.samsung.accessory.permission.accessory_framewo rk
send_sms
read_external_storage
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v561
read_contacts
com.android.vending.check_license
com.android.vending.billing
internet
access_fine_location
wake_lock
access_network_state
write_external_storage
write_settings
camera
location
vibrate
flashlight
access_wifi_state
change_wifi_state
get_tasks
modify_audio_settings
bluetooth_admin
bluetooth
broadcast_sticky
access_coarse_location
nfc
com.samsung.accessory.permission.accessory_framewo rk
com.samsung.android.providers.context.permission.w rite_use_app_feature_survey
send_sms
read_external_storage