SAP HANA Express (Docker Store) login details

How can one login to the SAP HANA Express 2.0 database after it has been set up from the Docker Store, following the instructions exactly. (using HXEHana1 as password)

This is what I get:

hxeadm@36c59c56cb91:/usr/sap/HXE/HDB90> hdbsql -i 90 -u SYSTEM -p HXEHana1 -n localhost:39013

Single Sign-On authentication failed

hxeadm@36c59c56cb91:/usr/sap/HXE/HDB90> hdbsql -i 90 -u hxeadm -p HXEHana1 -n localhost:39013

Single Sign-On authentication failed

What am I doing wrong?