You can roster Otus via Classlink's OneRoster API by following the steps outlined below.
Step 1: Within Roster Server, click on Apps then click on + ADD.
Step 2: Toggle on Show Development Apps and search for Otus. Click the blue + Add for the Otus [DEV] entry.
Step 3: Select Full Permissions and then click on Return to Apps.
Step 4: On the applications (Apps) page, search for Otus and toggle the Disabled button to Enabled.
To share demographics (gender, race/ethnicity), click on the Gear under Actions.
Step 5: Click on DataGuard and then click on Demographics.
Step 6: Check the Enable Demographics box and click on Save.