Google Blocks SSO Sign-up and Login through Embedded Browsers
Last Updated:
Overview
A user cannot sign in or login through an embedded browser (e. g. from Facebook Messenger). The below error is displayed:
403 error disallowed_useragent.
Applies To
- Login
- Embedded Browsers
- 403 error
Cause
Google OAuth does not work in embedded browser per policy. See this document for reference.
There are risks when implementing a login from an embedded WebView. Full documentation here.
Solution
The workaround is to use one of the alternatives recommended in the link, like Chrome Custom Tabs. The possible explanation for why it works in some cases could be related to each user's mobile configuration, whether they have Chrome as their default browser app.
