Hi,
You Key Vault is set to use Azure RBAC for giving access to Key Vault data plane instead via Key Vault Access Policies. Using Azure RBAC is now the recommended way so I would advise you to start using that way. Of course Access policies are not deprecated and you can set your Key Vault to use Access policies instead of RBAC. Switching back is done via access configuration tab on the Key Vault resource.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.