@Praveen Meesala Welcome to Microsoft Q&A Forum, Thank you for posting your query here!
Can you provide Storage Account Contributor (Permits management of storage accounts. Provides access to the account key, which can be used to access data via Shared Key authorization.) and check for the status!
The compute managed identity is listed under service principal of IAM Access.. I selected that and I gave Storage Blob Contributor access.
Based on the error message: You might not have been assigned the appropriate roles. The following sections describe the permissions to Blob Storage currently requires for access to your storage resources. Contact your Azure account admin if you're not sure you have the appropriate roles or permissions.
You don't have the appropriate permission to the Blob Container, Hence you are facing this issue. Please provide the access and check for the issue.
Assign an Azure role for access to blob data
Let me explain how this roles works and the define of the RBAC How RBAC works
If the issue still persist, please share the screenshot of the error message!
Please let us know if you have any further queries. I’m happy to assist you further.
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