可能是由于推送证书或Bundle Identifier的问题导致推送通知无法正常工作。您可以按照以下步骤进行修复：

1.确保您的应用程序的Bundle Identifier与您在后端设置中使用的Bundle Identifier匹配。

2. 检查您的应用程序是否已正确配置推送证书。您可以在Xcode中查看证书和配置详细信息。

3. 确保您的后端解析服务器已正确配置APNS证书。在后端控制面板中，选择“设置”>“通知”，输入您的.p12文件作为APNS证书，并确保密码正确输入。

4. 您还可以尝试使用您的.p12文件和证书密码手动设置APNS证书。请参阅以下代码示例：

let configuration = URLSessionConfiguration.default

configuration.httpAdditionalHeaders = ParseAPIConfiguration.headers(applicationId: "YOUR_APP_ID", clientKey: "YOUR_CLIENT_KEY")
configuration.urlCache = nil

let session = URLSession(configuration: configuration, delegate: nil, delegateQueue: nil)
let url = Bundle.main.url(forResource: "YOUR_P12_FILE_NAME", withExtension: ".p12")

let data = try! Data(contentsOf: url!)

let certificate = SecIdentityCreateWithCertifiacteData(nil, data as CFData, nil)

var rawPointer: CFArray?
let result = SecIdentityCopyPreference(certificate, &rawPointer)

if result != errSecSuccess {
   print("Could not create identity preference.")
}

let preferences = [] as NSArray
let preferencesValues = [] as NSArray

CFPreferencesSetValue("NSAppTransportSecurity", preferences, kCFPreferencesAnyApplication, kCFPreferencesCurrentUser, kCFPreferencesCurrentHost)
CFPreferencesSetValue("NSAppTransportSecurityAllowsArbitraryLoads", preferencesValues, kCFPreferencesAnyApplication, kCFPreferencesCurrentUser, kCFPreferencesCurrentHost)

CFPreferencesSynchronize(kCFPreferencesAnyApplication, kCFPreferencesCurrentUser, kCFPreferencesCurrentHost)

if result == errSecSuccess {
    print("Identity preference created.")
}

其中，“YOUR_APP_ID”