1Password is currently failing to find any fill matches. I've tried a variety that I know do fill correctly on the mac (and iOS extension), but in Android I get the 'No matching login was found ..' response. This is also the case for filling in apps. I have the custom keyboard and accessibility for 1password enabled.
A caveat though is that I've recently installed Android M developer preview. I can't say for sure that this caused the issue, as I haven't previously been using the fill feature much (I have tended just to copy/paste out of habit). I'm not expecting 1Password to support M yet of course. Just raising it as a possible issue.
1Password Version: 4.5b7
Extension Version: Not Provided
OS Version: Android M developer preview
Sync Type: Wifi (w/Mac)