As said before, there are two ways to fill in user name and password in Chrome on Android:
- Autofill framework: native funktion since an early version of Android Pie to present some kind of fly out menu when you are presented with a login form on a Chrome for Android web page.
- Accessibility feature: more like a notification (e.g. like a notification from a news app) you can use as a workaround to fill in your credentials into a web page’s login form.
I have NEVER seen a password manager that uses way method 1 without problems. Actually, Lastpass is presenting some kind of flyout but it does that for years and therefore cannot be using method 1 because this wasn’t available so long ago.
1password does not use method 1 either:
Android Pie did introduce Autofill compatibility mode, which allows password managers to fill usernames and passwords in browsers that haven’t fully implemented the Autofill API, like Chrome. However, when we tested this out in a couple of beta releases over the summer, we found an issue that made the experience worse than filling with Accessibility. So for now, this is not supported, and you’ll need to enable our Accessibility service to fill in Chrome.
Source: https://www.reddit.com/r/1Password/comments/a1ql1y/requirements_for_enabling_autofill_in_chrome_for/
That being said, a proper autofill in Chrome for Android IS a feature request. But it obviously is some tough nut to crack.