Thank you, grb. I have just read that reference material carefully and observe the following:
I have obtained the URI info for one of the apps by using the Play Store - Share technique and have placed androidapp:// in front of it. I have specified Default match detection.
When I look at the Bitwarden entry for this app, I see two URI’s - one for the website URL and the one I just created for the app. Tapping the launch icon for the website works and logs me into the associated account. I get no response when tapping the launch icon for the app. If it matters, there is no word or component in the first URI that is the same as those in the second URI.
If I launch the app directly, I see nothing that indicates any involvement by Bitwarden. What should I try next?