You can't know if some certificate is being considered valid or not by other clients you don't control.

You can't force a client you don't control to consider valid a certificate, in the same way you can't force that client to validate certain certificate either.

At the end, it's just up to the client, that's all I wanted to point out.

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As I said, it's always the client that decides whether a certificate (or CA) is valid or not.

https://security.googleblog.com/2024/06/sustaining-digital-certificate-security.html

Interesting, However this seems only limited to Google Chrome itself.