Provide Permissions for the Data Collection Rule
The data collection rule will not be able to ingest data into the Log Analytics workspace because it does not have the necessary permissions.
To address this, go to Data Collection Rules, select the DCR that you previously created, and go to IAM.
Access Control (IAM)
Use Assign permissions to a DCR as a guide for assigning permissions to the data collection rule.
After you've assigned permissions, it takes approximately 45 minutes for the permissions to propagate and for the API calls to succeed.