Use secure storage for app id so that it will persist over reinstalls. Use separate app identifier for extension in hockeyapp.

src/iOS.Core/HockeyAppCrashManagerDelegate.cs

@@ -1,20 +1,31 @@
 using Bit.App.Abstractions;
 using HockeyApp.iOS;
+using Newtonsoft.Json;
+
 namespace Bit.iOS.Core
 {
     public class HockeyAppCrashManagerDelegate : BITCrashManagerDelegate
     {
         private readonly IAppIdService _appIdService;
+        private readonly IAuthService _authService;
 
         public HockeyAppCrashManagerDelegate(
-            IAppIdService appIdService)
+            IAppIdService appIdService,
+            IAuthService authService)
         {
             _appIdService = appIdService;
+            _authService = authService;
         }
 
         public override string ApplicationLogForCrashManager(BITCrashManager crashManager)
         {
-            return $"AppId:{_appIdService.AppId}";
+            var log = new
+            {
+                AppId = _appIdService.AppId,
+                UserId = _authService.UserId
+            };
+
+            return JsonConvert.SerializeObject(log, Formatting.Indented);
         }
     }
 }