diff --git a/modules/cognitive-services/account/main.bicep b/modules/cognitive-services/account/main.bicep
index 06494998b2..5fbb6da6e4 100644
--- a/modules/cognitive-services/account/main.bicep
+++ b/modules/cognitive-services/account/main.bicep
@@ -201,19 +201,18 @@ resource defaultTelemetry 'Microsoft.Resources/deployments@2022-09-01' = if (ena
   }
 }
 
-resource cMKKeyVault 'Microsoft.KeyVault/vaults@2023-02-01' existing = if (!empty(cMKKeyVaultResourceId)) {
-  name: last(split(cMKKeyVaultResourceId, '/'))!
-  scope: resourceGroup(split(cMKKeyVaultResourceId, '/')[2], split(cMKKeyVaultResourceId, '/')[4])
-}
+resource cMKKeyVault 'Microsoft.KeyVault/vaults@2021-10-01' existing = if (!empty(cMKKeyVaultResourceId)) {
+  name: last(split((!empty(cMKKeyVaultResourceId) ? cMKKeyVaultResourceId : 'dummyVault'), '/'))!
+  scope: resourceGroup(split((!empty(cMKKeyVaultResourceId) ? cMKKeyVaultResourceId : '//'), '/')[2], split((!empty(cMKKeyVaultResourceId) ? cMKKeyVaultResourceId : '////'), '/')[4])
 
-resource cMKKeyVaultKey 'Microsoft.KeyVault/vaults/keys@2023-02-01' existing = if (!empty(cMKKeyVaultResourceId) && !empty(cMKKeyName)) {
-  name: '${last(split(cMKKeyVaultResourceId, '/'))}/${cMKKeyName}'!
-  scope: resourceGroup(split(cMKKeyVaultResourceId, '/')[2], split(cMKKeyVaultResourceId, '/')[4])
+  resource cMKKey 'keys@2023-02-01' existing = if (!empty(cMKKeyName)) {
+    name: !empty(cMKKeyName) ? cMKKeyName : 'dummyKey'
+  }
 }
 
 resource cMKUserAssignedIdentity 'Microsoft.ManagedIdentity/userAssignedIdentities@2023-01-31' existing = if (!empty(cMKUserAssignedIdentityResourceId)) {
-  name: last(split(cMKUserAssignedIdentityResourceId, '/'))!
-  scope: resourceGroup(split(cMKUserAssignedIdentityResourceId, '/')[2], split(cMKUserAssignedIdentityResourceId, '/')[4])
+  name: last(split((!empty(cMKKeyVaultResourceId) ? cMKKeyVaultResourceId : 'dummyMsi'), '/'))!
+  scope: resourceGroup(split((!empty(cMKKeyVaultResourceId) ? cMKKeyVaultResourceId : '//'), '/')[2], split((!empty(cMKKeyVaultResourceId) ? cMKKeyVaultResourceId : '////'), '/')[4])
 }
 
 resource cognitiveServices 'Microsoft.CognitiveServices/accounts@2022-12-01' = {
@@ -242,7 +241,7 @@ resource cognitiveServices 'Microsoft.CognitiveServices/accounts@2022-12-01' = {
         identityClientId: cMKUserAssignedIdentity.properties.clientId
         keyVaultUri: cMKKeyVault.properties.vaultUri
         keyName: cMKKeyName
-        keyVersion: !empty(cMKKeyVersion) ? cMKKeyVersion : last(split(cMKKeyVaultKey.properties.keyUriWithVersion, '/'))
+        keyVersion: !empty(cMKKeyVersion) ? cMKKeyVersion : last(split(cMKKeyVault::cMKKey.properties.keyUriWithVersion, '/'))
       }
     } : null
     migrationToken: !empty(migrationToken) ? migrationToken : null