I have a similar issue with bitwarden and etrade on and older android. 6.0.1 I believe it has to do with the different user interface between the mobile app and the browser app. This may be complicated by the fact that the browser accesses us.etrade.com and the mobile app cm.etrade.mobilpro.activity.
When I allow bitwarden to fill in the password I get an invalid password response from etrade. If I instead use the copy password function then paste the password into the mobile app I can sucessfully log in. My hypothesis is that bitwarden is putting something extra into the password field with autofill.
I can’t prove this, as etrade does not offer the option of showing a visible password. A possibility might be that it is putting the login name in the password field, but this is speculation.