1Password 8 doesn't even auto select the password I need (let alone autofill...)

Hey @PDXfoster:

That definitely isn't the experience we want you to have with Universal Autofill, so I'd be happy to help.

While it's absolutely possible to link apps to the Login item so they're suggested while filling, it's a slightly different process than the app://bundleid method that 1Password 7 used. To link a Login with an app, press ⌘+\ to Autofill, then search for the item you'd like to fill into your currently focused app. Tap Return to Autofill it, and you'll be asked to either Fill Once, or Fill & Update Login. If you fill once, the app won't be linked, but if you choose Fill & Update Login, the app will be added to the Linked Apps section of that item, where it will be suggested again in the future.

Let me know how you get on with that, and if you're still running into trouble, we can definitely take a closer look.

Jack