adding passport to iPhone 17 pro max

How are you trying to get it onto the iPhone exactly?

Are you following the steps here ➜ Use your Digital ID in Apple Wallet - Apple Support

What happens when you try to add your ID to the iPhone exactly?

Do you get an error? If so, what does it say?

click here ➜ Writing an effective Apple Support Communities Question - Apple Community

If the service is unavailable, you'll need to wait and try again when it is available.

I am curious if by chance you have a VPN installed on your iPhone? If yes, don't just turn it off, get RID of it. VPNs do nothing for you, but cause issues and they don't provide the security you've been led to believe they do.

See if this helps you --> Use your Digital ID in Apple Wallet - Apple Support