Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you would like to know if you could use multiple authentication types in a single VPN Gateway P2S Connections.
Yes, this is a supported scenario.
This exact requirement is documented here :
Configure a point-to-site VPN connection to a VNet using multiple authentication types
I believe you will be using "OpenVPN (SSL)" Tunnel type as of now.
For certificate based authentication, you will be required to use "IKEv2 and OpenVPN (SSL)" as the Tunnel type
To configure certificate based auth:
- Server Side : https://learn.microsoft.com/en-us/azure/vpn-gateway/vpn-gateway-howto-point-to-site-resource-manager-portal
- Client Side : https://learn.microsoft.com/en-us/azure/vpn-gateway/point-to-site-vpn-client-cert-linux
Please let us know if we can be of any further assistance here.
Thanks,
Kapil
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