Repetitive prompts for 1Password account password on the iPhone

I am a brand new 1Password user (as of 08/16/2021) and am having a similar problem on iOS (iPhone 12 Pro and iPad Pro, both with latest iOS updates). On the iPhone I set 1Password Security settings as Lock on Exit = Off, Auto-Lock = 10 Minutes. I am using Chrome browser. (I also set the 1Password Browser > User Agent to Chrome, but don't know if this has anything to do with the problem). When I bring up a web site in Chrome and then tap on a username (or password) field I normally get the "key" icon at the bottom of the screen with the word "Passwords" displayed next to it; when I tap on the "Key" I get the logon screen for 1Password, which -- after entering the master password -- will then work for that logon attempt and then immediately locks again. When I enable Face ID it works, i.e., when I tap on the Key icon it logs me in to 1Password without requiring the master password, but your web site says that Face ID utilizes Keychain, and hence there is always a possibility that the master password can be hacked. (In other words, I don't want to use Face ID).

By the way, I was careful to leave the 1Password in memory when I was using Chrome, although I believe that's not actually necessary. Please advise. Thanks!