samsung this model not easy to bypass 2019 frp security so using sim and bypass tutorial be careful look this videos.
first step you need a sim card with sim lock.
and then below take video.

REMOVE GOOGLE ACCOUNT ON SAMSUNG A8 AND A8+ ANDROID 8 and 8.1 WITHOUT A COMPUTER

This method work on :
samsung galaxy S7 android 8
samsung galaxy S8 android 8
samsung galaxy S9 android 8
samsung galaxy A3 android 8
samsung galaxy A5 android 8
samsung galaxy A7 android 8
samsung galaxy A8 android 8
samsung galaxy A9 android 8
samsung galaxy J2 android 8
samsung galaxy J3 android 8
samsung galaxy J4 android 8
samsung galaxy J5 android 8
samsung galaxy J6 android 8
samsung galaxy J7 android 8
samsung galaxy Note 9 android 8
samsung galaxy Note 8 android 8