Google will block embedded browser log-ins to fight phishing
 

Embedded browsers within apps can be useful if you want to use an existing account from another service -- say, your Gmail log-in -- to access their features. However, they're also really easy to weaponize for man-in-the-middle types of phishing atta...

https://www.engadget.com/2019/04/19/...-ins-phishing/