Device Attestation: Auto-Select Client Cert + User Login on Android

Hi everyone,

I’m trying to use client certificate authentication (mTLS) with Chrome Custom Tabs on Android. We want to automatically select the client certificate without prompting the user, and also ask for their username and password as part of the login process. This way, we can combine both certificate-based authentication and user credentials for device attestation.

On desktop Chrome, this can be done using a policy like AutoselectCertificateForUrls, but it seems this doesn’t work on Android. If this is a known limitation, is there a way to request this feature from the Android or Chrome team?