A3L Authentication Reference, Troubleshooting, and FAQ
Here you can find the A3L Authentication API reference, a list of scopes that A3L Authentication supports, troubleshooting information, and frequently asked questions.
A3L Authentication API reference
For details on the classes and methods contained in A3L Authentication, see the complete A3L Authentication API Reference.
Scopes supported by A3L Authentication
In A3L Authentication, a user can grant access to the scopes listed in the following table.
Troubleshooting
This section contains troubleshooting information to help you identify, isolate, and resolve issues you might encounter when integrating A3L Authentication.
Build fails for apps with minimum Android API level 20 or lower
If your app must support API level 20 or lower and multidex isn't enabled, it's possible your build could fail. To solve this issue, enable multidex for your app by following the guidelines in the Android developer documentation to Enable multidex.
Google Sign-In pop-up doesn't show after clicking Sign In
Check if you have the correct configuration in your API Console and in A3L Authentication. If you've provided the client ID, check the SHA1 and package name that you provided to create the client ID and make sure they match. If they don't match, Google doesn't recognize the app and the pop-up doesn't appear. Make sure to modify the credentials to have correct SHA1 and package name. For details about how to configure your app, see Configure Google API Console.
After authentication, Custom Tab redirects to Google homepage
If after authentication, the user is redirected to the Google homepage and not back to the app, you might have misconfigured your manifest placeholder. Provide the Android client ID prefix in the manifest placeholder inside the build.gradle file. For instructions, see Add A3L Authentication SDK to your project.
Unable to initialize A3L Authentication
If A3L Authentication initialization fails and you receive "Internal Error APIException", there might be a problem with your A3L Authentication SDK installation. Replace your A3L Authentication AAR with the latest version available.
FAQ
The following are frequently asked questions (FAQ) about A3L Authentication.
- Q: Why is it necessary to use minimum API level 21?
- A3L Authentication uses Androidx Security Crypto library internally for a more secure way of storing the necessary data. The minimum requirement for the library is API Level 21.
- Q: How does
setHostedDomain()work on different types of devices? - On devices with Google Play services enabled, the
setHostedDomain()method doesn't necessarily block the user from signing in to an app with an email that uses a different domain name.
If a user signs in to their device using an email that belongs to the hosted domain, only that email appears on the in-app sign-in window. If the user isn't signed in to the device with an email that belongs to the hosted domain and they attempt to sign in to the app, the app displays the Google Sign-In window (managed by Google Play services) to prompt the user to sign in to the device. A user can then choose to sign in with an email from a different domain. However, if they sign in with an email from a different domain, the in-app sign-in window doesn't show that email as a sign-in option like it does for emails that belong to the hosted domain.
On Fire OS devices, the
setHostedDomain()method restricts the user's email ID and allows it to be added only if it's within the hosted domain.
Last updated: Feb 11, 2026
