logic app keyvault connector with bicep : connector not found

Question

I'm trying to setup a logicapp with a keyvault-action to retrieve a secret. This logicapp is setup with bicep.

Everything is created, however when opening the LA-designer i get the error 'Connector not found'

The LogicApp is created with a 'system managed Identity' enabled :

resource myla 'Microsoft.Logic/workflows@2017-07-01' = {
  location: 'westeurope'
  identity: {
    type: 'SystemAssigned'
  }

To create the keyvault api connection I use this bicep code :

resource connection 'Microsoft.Web/connections@2016-06-01' = {
  name: 'keyvault-connection'
  location: 'westeurope'
  properties: {
    displayName: 'Azure keyvault'
    api: {
      id: '/subscriptions/${subscription}/providers/Microsoft.Web/locations/westeurope/managedApis/keyvault'
      displayName: 'Azure keyvault'
      description: 'Azure keyvault API'
      type: 'Microsoft.Web/locations/managedApis'
      }
    parameterValueSet: {
      name: 'oauthMI'
      values: {
        vaultName: {
          value: keyvaultName
        }
      }
    }
  }
}

I also have a roleassignemnt to link the la with keyvault :

resource roleAssignment 'Microsoft.Authorization/roleAssignments@2021-04-01-preview' = {
  scope: kv
  name: guid(resourceGroup().id,secretsUserRoleDefinitionId, myla.id)
  properties: {
    principalId: myla.identity.principalId
    roleDefinitionId: '/subscriptions/${subscription}/providers/Microsoft.Authorization/roleDefinitions/4633458b-17de-408a-b874-0445c86b69e6'
    principalType: 'ServicePrincipal'
  }
}

any clues what I am missing to resolve the 'connector not found' error ?