Error: Bicep deployment of maintenance configuration + dynamic scope for Update Manager

targetScope = 'subscription'

@description('Resource location')
param location string

@allowed([ 'Any', 'All' ])
@description('Filter Operator')
param filterOperator string = 'All'

@description('tagName to match against')
param searchTagName string = 'tagname'

@description('maintenanceConfiguration resourcegroupname')
param resourceGroupName string

@description('Maintenance Configuration Name')
param maintenanceConfigurationName string

param subscriptionId string = subscription().id

resource maintenanceConfiguration 'Microsoft.Maintenance/maintenanceConfigurations@2023-04-01' existing = {
  scope: resourceGroup(resourceGroupName)
  name: maintenanceConfigurationName
}

resource maintenanceConfigurationAssignment 'Microsoft.Maintenance/configurationAssignments@2023-04-01' = {
  name: guid(maintenanceConfiguration.name, location, subscriptionId)
  properties: {
    filter: {
      locations: [ location ]
      osTypes: [ 'Windows', 'Linux' ]
      resourceTypes: [ 'Microsoft.Compute/virtualMachines' ]
      resourceGroups: []
      tagSettings: {
        filterOperator: filterOperator
        tags: {
          '${searchTagName}': [ maintenanceConfiguration.name ]
        }
      }
    }
    maintenanceConfigurationId: maintenanceConfiguration.id
    resourceId: subscriptionId
  }
}