Hi @farhan7644
Welcome to Microsoft Q&A Forum, thank you for posting your query here!
I understand that you have set vault immutability and have locked it. it is irreversible. In this case, to delete the vault you need to contact Azure technical support to connect with Azure backup product team to help you with deletion of vault.
Note: Your consent is required to delete the data and once the data is deleted, you will not get it back.
Here is the link -
Link to raise request: contact Azure support
Instructions Link to raise request: https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request
Hope this answers your question. Let us know if you need any assistance reaching out to Azure technical support team.
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