Deleting Recovery Service Vault Backup Server (MABS)

This is one of them quick shares to try help the world of Azure developers just a little bit.

While doing some Azure Development using the Microsoft Azure REST API, I got to a point to working in the Azure Recovery Service Vault. I was trying to delete a Back Up Server Agent using the API, which after a little bit of a hunt I found it is actually called ‘Registered Identities‘

This of course only has one endpoint to call, so it must just be that easy…
However when calling this API I would just get the following:

{
"error":
{
"code":"ServiceContainerNotEmptyWithBackendMessage",
"message":" There are backup items associated with the server. Stop protection and delete backups for each of the backup items to delete the server's registration. If the issue persists, contact support. Refer to https://aka.ms/DeleteBackupItems for more info. ",
"target":null,
"details":null,
"innerError":null
}
}

This was odd as I couldn’t find anything to imply a reason for this error. After then investigating the network traffic while deleting the resource in the Azure Portal, I found a slight difference which also fixed the issue. This was the version of the API.

In the documentation it is stated as ‘2016-06-01’ , but in the network traffic it had version ‘2019-05-13’. If you now change:

DELETE https://management.azure.com/Subscriptions/77777777-d41f-4550-9f70-7708a3a2283b/resourceGroups/BCDRIbzRG/providers/Microsoft.RecoveryServices/vaults/BCDRIbzVault/registeredIdentities/dpmcontainer01?api-version=2016-06-01

To

DELETE https://management.azure.com/Subscriptions/77777777-d41f-4550-9f70-7708a3a2283b/resourceGroups/BCDRIbzRG/providers/Microsoft.RecoveryServices/vaults/BCDRIbzVault/registeredIdentities/dpmcontainer01?api-version=2019-05-13