Error processing request. HTTPS required

[RebootsSaveLives]

I'm having some issues with trying to get SSO working.

Forgive me if I have a weird setup. I'll detail it below:

• jellyfin.mydomain points to NPM (Nginx Proxy Manager)
• NPM has Let's Encrypt SSL setup, so visiting jellyfin.mydomain will convert it to https.
• Authentik is configured correctly as the OpenID Provider (Same setup and working for other services such as Actual Budget, Komga, Mealie, etc...)
• Because jellyfin.mydomain doesn't point directly to the instance, I have to use http:// for the configuration URL.

I checked the logs and for some reason, Jellyfin is requiring HTTPS even though I have the checkbox "Disable OpenID HTTPS Discovery (Insecure)" checked. Can someone help? Log below:

[2025-07-22 00:02:50.703 +00:00] [INF] [167] Emby.Server.Implementations.Session.SessionWebSocketListener: Sending ForceKeepAlive message to 1 inactive WebSockets.
[2025-07-22 00:05:46.800 +00:00] [INF] [166] Jellyfin.Plugin.SSO_Auth.Api.SSOController: SSO Controller initialized
[2025-07-22 00:05:46.802 +00:00] [ERR] [166] Jellyfin.Api.Middleware.ExceptionMiddleware: Error processing request. URL "GET" "/sso/OID/start/authentik".
System.InvalidOperationException: Error loading discovery document: Error connecting to http:///application/o/jellyfin/.well-known/openid-configuration. HTTPS required.
---> System.InvalidOperationException: HTTPS required