I followed two suggestions , thanks to bot threads ( one about default browser with 2FA off, and the other about changing schwab password.):
Download Microsoft Edge to mac, and changed edge to default browser ( in case Safari is the default )
From Schwab, set 2FA ( two factor authentication ) to allow trusted devices, and change password on Schwab.
logon to schwab from Edge.
Shutdown my Mac, restart. Finally I can import from schwab.
