The main reason is that these apps use embedded WebViews for signing in with OAuth 2.0, which Google stopped allowing after September 30, 2021. It can also happen if you are using an old app or device that cannot open a safe external browser. In this article, we will discuss different ways to solve this error.
1. Update the App to the Latest Version
Before taking further action, the first step is to ensure the application is updated to the latest version, as the error may have already been fixed in a recent release. App updates often include changes that address security and compatibility with Google’s authentication systems. The process for updating your app differs slightly between Android and iOS devices. Please follow the guide that corresponds to your device’s operating system:
1.1. Update the Problematic App on Android
While Android devices may auto-update apps by default, the timing can vary depending on your network settings (Wi-Fi or mobile data) or if your device is in battery-saving mode. To make sure the latest version is installed, you can manually check for updates using the Manage Apps & Device function. Note: The instructions are the same for both Android smartphones and tablets.
1.2. Update the Problematic App on iOS
iOS devices strongly encourage you to keep apps up-to-date, but if auto-update is turned off, you may need to update apps manually. Ensuring your app is updated can address compatibility issues with Google services. Note: These instructions apply to iPhone, iPad, and iPod Touch.
2. Contact the App Developer
If updating the app did not resolve the issue, it is likely that the Error: disallowed_useragent persists because the application still uses an authentication method that Google has deprecated. The resolution requires the developer to update the app’s login process or transition to a supported authentication approach. If you are a regular user, the best way to expedite a solution is to inform the app developer about the issue using official channels. Developers rely on user feedback to prioritize fixes for critical errors, especially those impacting authentication.
2.1. Contact the Developer on Android
To contact an Android app developer, locate their contact details in the Play Store listing. Please note some responses might take time, especially from smaller development teams. The instructions below work for smartphones, tablets, and Android TV devices. The location of the contact details varies slightly.
2.2. Contact the developer on iOS
For Apple devices, you can reach the developer using the App Support option on the app’s product page in the App Store. Apple’s guidelines require timely support, so developers are generally responsive. Note: You can follow these steps on iPhone, iPad, and iPod Touch. On watchOS, you will need to use the paired iPhone.
