Rancher Server Setup

• Rancher version: v2.9-head 3a6de11e
• Installation option (Docker install/Helm Chart):
  • If Helm Chart, Kubernetes Cluster and version (RKE1, RKE2, k3s, EKS, etc): docker

Information about the Cluster

• Kubernetes version: v1.30.2+k3s2
• Cluster Type (Local/Downstream): downstream

Describe the bug
When GenericOIDC(keycloak) auth provider is enabled, users are not populated in the dropdown search bar when adding users to a cluster/project.

To Reproduce

1. Install rancher v2.9-head
2. Create a downstream cluster
3. Enable GenericOIDC using keycloak
4. In the downstream cluster go to Cluster & Project Members -> Add
5. Click the dropdown in the search bar and observe no users show.

Expected Result
Users in the auth provider are shown, similar to Keycloak auth provider when not using GenericOIDC.