Authentik OpenID failing with OpenID redirect failed. Request failed (500)

Running Docker on a Proxmox Cluster (all latest production versions).

On the Docker I have running: ActualBudget, Paperless, Portainer, Authentik, NPM Proxy Manager, and so on…

Authentik is up and working with ActualBudget, Paperless and Portainer.

When I try and login using OpenID on Proxmox I get “OpenID redirect failed. Request failed (500)”

My Realm on the Proxmox Cluster is setup is attached...

I have not made any configuration changes to NPM Proxy Manager since...

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