（ANDROID SDK）FirebaseAnalytics..getAppInstanceId generated an ID with a length of 64. Under what circumstances would an ID of length 64 be generated?

[wangtengyuty]

In the past year, the IDs generated by FirebaseAnalytics.getAppInstanceId() have consistently been 32 characters long. However, I recently observed that it generated an ID with a length of 64. Under what circumstances would a 64-character ID be generated? Is this expected behavior, or could it indicate an issue?

[google-oss-bot]

I couldn't figure out how to label this issue, so I've labeled it for a human to triage. Hang tight.

[lehcar09]

Hi @wangtengyuty, thank you for reaching out. Per documentation,

The app-instance ID value must be a 32 hexadecimal without dashes or RFC 4122 version-4 UUID without the dashes.

I tried retrieving the Google Analytics app instance id on an emulator (Medium Phone and Pixel 8a) and I got 32 characters.

FirebaseAnalytics.getInstance(this).appInstanceId.addOnCompleteListener { task ->
            if (task.isSuccessful) {
                val appInstanceId = task.result
                Log.d("Analytics", "App Instance ID: $appInstanceId")
            } else {
                Log.e("Analytics", "Error getting app instance ID", task.exception)
            }
        }

And, I'm using the dependencies below:

// build.gradle.kts
plugins {
    id("com.android.application") version "8.10.0" apply false
    id("com.android.library") version "8.10.0" apply false
    id("org.jetbrains.kotlin.android") version "2.1.20" apply false
    id("com.google.gms.google-services") version "4.4.2" apply false
}

// app/build.gradle.kts
dependencies {
    ...
    implementation(platform("com.google.firebase:firebase-bom:33.14.0"))
}

Does the behavior reproducible? or does it occur on specific device?

Can you share the dependencies you're using?

Thanks!