I have multiple VNets in my Azure environment and they all have P2S VPN set up. It works, users authenticates with certificates. Now, how can I enable logging for successful and failed authn for it?
As far as I know, Azure P2S VPN doesn't support the audit yet. There is an official site that users can post their feedback. Someone has already requested the same feature on it:
Provide auditing capabilities for Point to Site VPN
You may try to up vote it on this site.