You can rerun the wizard as often as you like. You can either reuse the previously created Azure Application, or create a new one.
Before doing it, please run the following commands:
ucr set office365/debug/werror=yes
invoke-rc.d univention-directory-listener restart
This will make the relevant code write debugging output with a high priority (as if all were errors).
univention-directory-listener-ctrl resync office365-user
This will force the connector to try to create the users marked for office365, again. And this time we'll get a lot of debugging output.
The file /var/log/univention/listener.log will contain the interesting log. Please send us the complete file.