Filter a nested array and dictionary

I am trying to filter the array which consist of array and dictionary inside it. I want to filter based on the type of the service and then whose isPrimaryMailbox is Yes under attributes array. This is what I have done:-

let services = Manager.realm().objects(Service.self).filter("type = %@", "MAILBOX")

        let serviceWithPrimaryEmail = services.filter({$0.attributes.first?.value == "Yes"})

But this is showing the data which has isPrimaryMailbox value is No

Below is the json response :-

{
  "data": {
    "cust": [
      {
        "customerId": "2040349110",
        "serv": [
          {
            "bill": "2010007656959",
            "services": [
              {
"type": "MOBILE",
                "status": "ACTIVE",
                "plan": {
                  "name": "Mobil"
                },
                "addOns": [
                  {
                    "status": "Active"
                  }
                ],
                "hardware": [
                  {
                    "type": "HANDSET"
                  }
                ]
              },
              {
                "type": "MOBILE",
                "plan": {
                  "name": "Mobile Service"
                },
                "addOns": [
                  {
                    "status": "Active"
                  }
                ],
                "hardware": [
                  {
                    "type": "HANDSET",
                  }
                ]
              },
              {
                "type": "MAILBOX",
                "plan": {
                  "name": "Service"
                },
                "attributes": [
                  {
                    "name": "mailboxSize",
                    "value": "1 GB"
                  },
                  {
                    "name": "isPrimaryMailbox",
                    "value": "Yes"
                  }
                ]
              },
              {
                "type": "MAILBOX",
                "status": "ACTIVE",
                "plan": {
                  "name": "Service"
                },
                "attributes": [
                  {
                    "name": "mailboxSize",
                    "value": "1 GB"
                  },
                  {
                    "name": "isPrimaryMailbox",
                    "value": "No"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  }

                                                

                                                                                                        REPLY
                                                    
                                                
                                                


                                                    

                                                        
                                                            0
                                                            views 

                                                            0
                                                                likes 
                                                            
                                                            

                                                            0
                                                            shares

                                                            


    

         Facebook
        
         Twitter
        
        
         Linked In 
        
          WhatsApp