Application.RequestAdvertisingIdentifierAsync returns empty idfa on iOS

Hi,

On recent versions of Unity (Unity 2019.3.6f1, Unity 2018.4.19f1, Unity 2017.4.38f1 ) Application.RequestAdvertisingIdentifierAsync method callback gets empty idfa. It wasn't issue before March Unity releases, I can't find anything on internet and submit bug report last week but nothing happens.

This is serious issue we're having, anything undocumented changed I'm not aware of or is this a bug with last releases ?

Thanks,
Emin

 

Same for me. Happened after updating from 2019.3.3 to 2019.3.7.
Double checked ”limit ad tracking” setting, it is not enabled.
@menelaus so you have a bug tracker link?

 

I've experienced this with 2019.3.7

Updated to 2019.3.9 and now it appears that I'm getting it correctly again.
@menelaus and @andersTheNinja , can you also update to 2019.3.9 and check?
It will raise the confidence level that this isn't just a coincidence...

 

@eladleb4
Updated to 2019.3.10f1, no luck. Not getting any device Id. Tried resetting id in iOS settings, still nothing.
Admob is still able to get the correct id, it emits a log message like "use this id to get test ads", with the same string as before. Only Unity itself seems unable to get the ID.
I created a blank project to test, and it did not work so it's not my project either.

 

Same here. Moved from 2018.4.18f1 to 2018.4.21f1, and now I get empty string.

 

File a bug report #1242276.

My assumption this was broken in 2018.4.19f1 and 2019.3.4f1 by fixing #1219457.

 

I had it working perfectly for a while using 2019.3.9 and then after another app update it stopped working (using the same unity version).
Now I get the same behavior as I did a month ago.
@amjad2172005 can you post a link to the issue? Couldn't find it in the issue tracker..

 

I went back to the working build with 2019.3.9 and it still works properly...
It could be another component that breaks RequestAdvertisingIdentifierAsync (I'm using firebase and Facebook's SDKs).

 

I found an interesting lead... Let me know your thoughts.

I traced back to the single commit where the issue started happening and the only difference was my debug logs.

When I removed the logs, it stopped working (tracking enabled = false).
When I included them, it's working (tracking enabled = true and getting an identifier).

Here is the interesting line:

Code (CSharp):

1.  
2. #if UNITY_IOS
3. Debug.LogFormat("AdsID  {0}",UnityEngine.iOS.Device.advertisingIdentifier?? "NULL");
4. #endif
5.  

I didn't have any more time to investigate but I suspect it may have to do with code stripping, as I access the iOS.Device.advertisingIdentifer.
I'll ship a new version with this log included and keep my fingers crossed for now.

[May 18th update]
After adding the above I'm getting the advertising identifier as expected.

 

The bug is confirmed: https://issuetracker.unity3d.com/is...stadvertisingidentifierasync-returns-empty-id.

 

@eladleb4 it is reproduced on unity 2017.4.40f1.
With UnityEngine.iOS.Device.advertisingIdentifier, the RequestAdvertisingIdentifierAsync is working, without Device.advertisingIdentifier, RequestAdvertisingIdentifierAsync return false with an empty error string.

Has nothing to do with ios14.5. It's reproduced on ios 14.4.2 and 12.5