Hi!
Embedded login using the web view component is not recommended and the latest SDK does not support this.
According to the Best Current Practice for OAuth 2.0 for Native Apps, only external user agents (such as the browser) should be used by native applications for authentication flows. Using the browser to make native app authorization requests results in better security and it gives users the confidence that they are entering credentials in the right domain. It also enables use of the user’s current authentication state, making Single Sign-on (SSO) possible.
Best Current Practice for OAuth 2.0 for Native Apps:
https://www.rfc-editor.org/rfc/rfc8252.txt
Google blocks OAuth requests from embedded browsers: