Help: Backup Yubikey functioning as a 2nd key, rather than a backup key
I'm new to using physical security keys. For many years I have managed passwords using 1Password. My intention is to use Yubikey for my most critical accounts (1Password, primary Google account, banking, etc.). I purchased two keys with the 2nd to function as a backup to the 1st.
After registering both keys in the Yubikey app, I went about registering the keys with the various services. Later, as I tried to authenticate with these services using my Yubikey, some services wouldn't recognize the key. I then tried the 2nd key, which worked. After trying a few services, I realized it's a tossup as to which key works with which service.
What's the best course of action to recovery from and/or correct this bizarre setup I created?
Thanks in advance. Any help is appreciated.