Configure the Identity Provider as an Authentication Method

From the left navigation panel, click Gateways & Servers.
Open the applicable Security Gateway / Cluster object.
From the left tree, expand VPN Clients > click Authentication.
Clear the checkbox Allow older clients to connect to this gateway.
In the section Multiple Authentication Clients Settings, add a new object (click Add > click New) or edit an existing object (click Edit).

From the left navigation panel, click Gateways & Servers.
Open the applicable Security Gateway / Cluster object.
From the left tree, expand VPN Clients > click Authentication.
Clear the checkbox Allow older clients to connect to this gateway.
In the section Multiple Authentication Clients Settings, add a new object (click Add > click New) or edit an existing object (click Edit).