Log into your carbon server. https://172.16.1.123:9443/carbon/
Default user:password is admin:admin.
Go to Multitenancy > Add new tenant and fill in all fields.
Save and go to https://172.16.1.123:9443/emm and login with your new credentials. In my case admin@maxmalm.se and the password I picked.
I got an error here when the site redirected me to localhost instead of the IP-address, I solved this in a manner not found in the documentation so it might be ugly and non-recommended. Anyways:
nano repository/conf/sso-idp-config.xml
and change
<AssertionConsumerService>https://localhost:9443/emm/acs</AssertionConsumerService>
to
<AssertionConsumerService>https://172.16.1.123:9443/emm/acs</AssertionConsumerService>