When i bought it it didn't had preinstalled the Samsung members, when i try to install it from play and galaxy store, it says not compatible with device
I suggest you do a factory reset .
I did and nothing changed
Maybe it's the same problem as this here : https://us.community.samsung.com/t5/Galaxy-S8/Samsung-Account-Authentication/td-p/328721
Anyway, I suggest you contact the support.