One time about a month ago, I had it set up where I could use Touch ID to unlock 1Password. Then one day that abruptly stopped working. Now, even though I have it set to do exactly that, it never works. I am never asked to provide Touch ID to unlock, only the passcode.
See attachment which shows I've got the setting turned on.
1Password Version: 7.1.2
Extension Version: 220.127.116.11
OS Version: 10.13.6
Sync Type: Not Provided