There are some browser behavior changes in 2024, related to 3rd parties cookies.
You can try follow the guide provided by Google.

To make the signInWithRedirect() flow seamless for you and your users, the Firebase Authentication JavaScript SDK uses a cross-origin iframe that connects to your app's Firebase Hosting domain. However, this mechanism doesn't work with browsers that block third-party storage access.

https://cloud.google.com/identity-platform/docs/web/redirect-best-practices