Key Vault access policy inconsistently deployed

Hey all,

I am deploying a key vault and creating an access policy in it to allow a Function App to read secrets from it. From the deployments tab I can see that that access policy module has ran successfully but it's missing in the key vault's access policy tab. Here is the bicep for it:

resource keyVault 'Microsoft.KeyVault/vaults@2022-11-01' = {

  name: keyVaultName

  location: location

  properties: {

    sku: {

      family: 'A'

      name: 'standard'

    }

    accessPolicies:[]

    tenantId: tenantId

  }

}

module KeyVaultAccessPolicy '../keyvault/key-vault-access-policies.bicep' = {

  name: 'KeyVaultAccessPolicy'

  params: {

    keyVaultName: bulkUploadFunctionAppKeyVaultName

    operation: 'add'

    policies: [ {

      objectId: bulkUploadFunction.outputs.identityPrincipleId

      permissions: {

        secrets: ['get', 'list']

      }

    }]

  }

}

Here is the code for the access policy bicep module:

@allowed([

  'add'

  'remove'

  'replace'

])

param operation string

@minLength(3)

@maxLength(24)

param keyVaultName string

param policies array

resource keyVault 'Microsoft.KeyVault/vaults@2019-09-01' existing = {

  name: keyVaultName

  resource keyVaultPolicies 'accessPolicies@2019-09-01' = {

    name: operation

    properties: {

      accessPolicies: [for policy in policies: {

        objectId: policy.objectId

        tenantId: keyVault.properties.tenantId

        permissions: policy.permissions

      }]

    }

  }

}

Any idea why that could be ?
Thanks in advance!