The pre-requisites for OneConnect include the following:
Office 365 Tenant
Service Account(s) with appropriate licenses. It is important that each integration requires a unique service account to prevent potential throttling issues.
Approve the OneConnect App
An Office 365 Tenant Administrator needs to approve the OneConnect app.
1. Login to https://my.oneconnect.ai and approve the consent form from Microsoft. Be sure to check the “Consent on behalf of the organization” box if available.
2. Complete the registration information and click Submit.
3. In the top right corner, hover over the Gear icon and click the Setting link. Click the "Grant Admin Consent" button to Consent approval for all users.