WTH is 1Password not working on desktop

Month of "What the heck?!"
1

While 1password autofill works great to log into HA on mobile, it’s not working on desktops.

I don’t get the difference for e.g. the chrome plugin not working there.
It’s working with the android autofill API though

2

Probably duplicate of WTH does autofill for usernames/passwords/2FA codes not work?

3

Closing as a duplicate of the above. Please vote there.