Face ID Not Working [Fixed. Please see the approved answer for details.]

I recently upgraded to 1Password 8.
Now every time I am in an app on my iPhone 13 (running 15.6.1) and I tap 'passwords' to go to 1Password, this simple, beautiful, seamless functionality of opening 1Password with FaceID does not work.
It says 'You need to enter your account password before you can use FaceID'. This I have done over, and over again.
Plus I have switched FaceID on and off, and turned the phone on and off, many times and still it is stuck.
FaceID is
1. enabled in Settings, under 'FaceID';
2. on in Settings under '1Password';
3. on in the 1Password app under 'Security'.
What is to be done here? Hella frustrating.
Thank you...

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