Windows 10 is SMB2 and 3, so 139 doesn't work for a port, 445 is needed or you need to modify Windows 10 to use SMB1.
MAIN-PC\Administrators is not a user, it is a group, and cannot be used to login from the printer, try adding a user to the admin group called XeroxScan and of course give it a password to use and add it to the share. Make sure you get the formatting of the user right too, since Win10 wants it in email form, not Domain\User , which can be see here (use the one in brackets)
Share name should not have the leading \ in most cases, so try without too.