Hi @besian
Welcome to Microsoft Q&A Forum. Thanks for posting your query here!
We see that you we're not able to delete the folders or container because of the policy though the Immutable blob storage access policy expired.
If the Access policy is not deleted or policy is in Lock state even though the immutability policy expired, you may not be able to delete the folders or the containers. To resolve this, check if the immutability policy can be modified or deleted. If the policy is still active, you may need to unlock it or remove it before you can delete the container or its folders, you need to delete the policy you uploaded using the context menu, next delete the container(s), then finally you can delete the storage account.
If you are still unable to delete the container and its folders, you can try using Azure Storage Explorer or Azure PowerShell to delete the container. These tools may be able to bypass any policies that are preventing the deletion.
There is a similar thread discussion in the Q&A forum, please refer to the suggestion and let me know the status.
I hope this helps! Let me know in the comments if you have further questions. Comment is the fastest way to reach the experts for any questions or help you need.
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