If you don't care about the data you could hard reset the phone in this way it will clear everything. Of course you will need to re-enter your google email account and password to verify that the phone is yours.
Hard Reset for S9+
# Hold down the ***Power key + Volume Down*** for a few seconds to hard switch off/restart the mobile.
# Plug in cable to PC.
# In the second step start pressing ***Volume Up*** + ***Bixby*** + ***Power button*** for a couple of seconds.
# Let go of all buttons when the ***SAMSUNG*** logo appears.
# If you see ***Android Robot*** with ***"No command"*** tap on the screen.
# After that select ***"wipe data/factory reset"*** by using ***Volume buttons*** to navigate and the ***Power key*** to confirm that.
# In this mode choose ***"Yes -- delete all user data".*** Use ***Volume keys*** to scroll down and the ***Power button*** to accept it.
# Finally select ***"reboot system now"*** with the ***Power key.***
Good Luck!