Firebase Dynamic Links on Unity iOS says "Deep Link does not contain valid required params"

Question

I'm using Firebase Dynamic Links for Unity, and I've got it working well with Android. I've even got a solution for Desktop, where the fallback link takes users to a webpage where I can provide instructions to the user for how to get their link content on Desktop.

On iOS, however, I always get errors like this when trying dynamic links:

[Firebase/Analytics][I-ACS023001] Deep Link does not contain valid required params. URL params: {
    "_cpb" = 1;
    "_cpt" = cpit;
    "_fpb" = "CIAIEIAGGgVlbi11cw==";
    "_iipp" = 1;
    "_iumchkactval" = 1;
    "_iumenbl" = 1;
    "_osl" = "https://cgs.link/zu_tiles_hime?_iipp=1";
    "_plt" = 260;
    "_uit" = 1064;
    apn = "com.finoldigital.cardgamesim";
    cid = 8062347334713659136;
    ibi = "com.finoldigital.CardGameSim";
    isi = 1392877362;
    link = "https://www.cardgamesimulator.com/link%%3Furl%%3Dhttps://www.cardgamesimulator.com/games/zu_tiles_hime/zu_tiles_hime.json";
    sd = "Play Zu Tile: Hime on CGS!";
    si = "https://www.cardgamesimulator.com/games/zu_tiles_hime/Banner.png";
    st = "Card Game Simulator - Zu Tiles: Hime";
}

I saw in another issue that it could be because of ?, =, and & symbols in the link, so I url-encoded those, but I am still getting the same error.

For reference, my code for iOS is effectively:

private void Start()
{
            FirebaseApp.CheckAndFixDependenciesAsync().ContinueWithOnMainThread(task =>
            {
                var dependencyStatus = task.Result;
                if (dependencyStatus != DependencyStatus.Available)
                {
                    Debug.LogError("Could not resolve all Firebase dependencies: " + dependencyStatus);
                    return;
                }
                DynamicLinks.DynamicLinkReceived += OnDynamicLinkReceived;
            });
}

I immediately log in OnDynamicLinkReceived, so this callback is clearly never happening. Does anybody know what I am doing wrong, or what I could do to get the dynamic link received callback?

Answer 1

For anyone who runs into the same issue: I solved this by modifying my build script to add the values for FirebaseDynamicLinksCustomDomains and FirebaseAppDelegateProxyEnabled to Info.plist as part of my build process.

PostProcess code:

var pbxProjectPath = PBXProject.GetPBXProjectPath(buildPath); 
var pbxProject = new PBXProject(); pbxProject.ReadFromFile(pbxProjectPath); 
const string targetName = "Unity-iPhone"; var targetGuid = pbxProject.GetUnityMainTargetGuid();
 var src = AssetDatabase.GetAssetPath(file); 
var fileName = Path.GetFileName(src); 
var dst = buildPath + "/" + targetName + "/" + fileName; 
if (!File.Exists(dst)) FileUtil.CopyFileOrDirectory(src, dst); pbxProject.AddFile(targetName + "/" + fileName, fileName); 
pbxProject.AddBuildProperty(targetGuid, "CODE_SIGN_ENTITLEMENTS", targetName + "/" + fileName);
 pbxProject.WriteToFile(pbxProjectPath);
 var plistPath = buildPath + "/Info.plist";
 var plistDocument = new PlistDocument(); plistDocument.ReadFromString(File.ReadAllText(plistPath)); 
var rootDict = plistDocument.root; 
rootDict.SetBoolean("FirebaseAppDelegateProxyEnabled", false);
 PlistElementArray customDomains = rootDict.CreateArray("FirebaseDynamicLinksCustomDomains");
 customDomains.AddString("https://cgs.link"); 
File.WriteAllText(plistPath);