Please see if below steps in below document helps
===============================================
If the response helped, do "Accept Answer" and upvote it -- Vaibhav
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I am unable to delete a recovery services vault. The error message is: "Vault cannot be deleted as there are existing resources within the vault. : 210902-13."
The resource 210902-13 does not exist in the vault I have gone as far as to install Chocolaty and verify the item does not exist. If I try to delete the vault using Chocolaty I do not receive a dependency error but the vault does not delete. If I try to delete the said item 210902-13 using Chocolaty I get a resource does not exist error message.
I need to delete this vault and close my subscription ASAP.
Please see if below steps in below document helps
===============================================
If the response helped, do "Accept Answer" and upvote it -- Vaibhav
I've already followed these steps.