Password for a specific website not filling in

To add to your comment:

I'm using 1password 7.9.4 on Mac with Monterey.
Usually only use the desktop app, fill in my username & copy over the password.
But recently re-installed the annoying browser app for Firefox.
In my experience, the 1P Firefox browser app only works when the 1P desktop app is already open.

For either https://www.pssummit.com or https://www.pssummit.com/VIP4Pass
On the login page, the 1P icon appears & shows the login title & username
But when I click the little box to fill the login ----> nothing happens!

Even if I open the 1p Firefox browser mini window (which I rarely do)
Select the pssummit login
Click 'open and fill' ----> nothing happens!

Filling login has often been reliable as long as:
the info desired is username & password
that info is in the fields in a login page
the 1p desktop app is already open & 1p Firefox browser app installed

Then I clicked to post this comment & had to sign in here.
hahahaha
1p Firefox browser app says no item!
Even when I scroll & select that page in the desktop app.
So I typed username & did copy & paste for password.
Then 1p Firefox browser app asks if I want to save the login.
(Nope. Already have it.)