Default [Q] Access to a delegated Gmail account via Android 4.8


I delegate access to my Gmail to another person so he can read, send, and delete message on my behalf as describe here :

Using a computer, this personn can access to the delegated Gmail without any problem.

Before Android Update 4.8, he used to access to this delegated Gmail on mobile Nexus 5. Using his Chrome navigator, he access to his Gmail account after entering username and password. Then he just had to click on the icon that represents three horizontal lines at the top left and he granted a page where there is his gmail address in the middle. By clicking on this icon then he could select the delegated inbox.

Since Android 4.8 update, the delegated Gmail doesn't appear anymore... Can someone help me to access to a delegated Gmail on android device ?

Thank you in advance for your help.