In order to grant permissions to an app, the owner role is required.
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Click on Subscriptions
2. Click on your subscription
3. Click on Access Control (IAM)
4. Click on Add → Add role assignment
5. Click on the search box & enter the role name as Reader role
6. Select the role & click next
7. Click on Select Members
8. Enter the App name (which you have created in Step-1 : Create Azure Active Directory app ) & Click Select
9. Click Next
10. Click Review + assign