Prompting to save password for an existing site

I have https://www.aa.com saved with default match detection (base domain is my default). When I click on the Login button on the website, it directs me to Log in – AAdvantage account login and password – American Airlines

Shouldn’t this still be recognized as an existing site since I have multiple AA accounts (myself and family members) created already? I keep getting a prompt on top asking “Should Bitwarden remember this password for you?” A simple fix might just to set the URI match detection to Never for all my AA accounts but curious why this is happening. All other sites seem to be working fine so far.

Thanks.