Error while getting certificate https://oaaskvtest.vault.azure.net/certificates/XXXXX from keyvault Index was outside the bounds of the array.

Question

I am trying to use a Geneva Action which basically can read and access the key vault. I have configured all the setting for the key vault. But I am unable to this step because I am using RBAC Key vault:

Also, I added the service principle for my KV, but I am not able to fetch that information: $AppGw = Get-AzApplicationGateway -Name "GenevaActionsTestKeyVaultHelperAAD" -ResourceGroupName "OaaSCertKV"

 Its throwing an error:

Please help me resolve this.

Thanks!