Thank you for posting your query on Microsoft Q&A, from above description I could understand that you are facing issues in loading the MDFC dashboard.
- Make sure that the user who first enabled Defender for Cloud on the subscription and the user who wants to turn on data collection have the Owner or Contributor role on the subscription.
- If so, users with the Reader role on the subscription can see the dashboard, alerts, recommendations, and policy.
If you don't have any further queries and the suggestion above answers your ask, please "Accept the answer", This will help us and others in the community as well.
Thanks,
Akshay Kaushik