WebSocket Error 400: Bad Request

I have an application (GDK Broadway) protected by Cloudflare Zero Trust. I can access it fine, but my client can’t connect via WebSocket:

Firefox can’t establish a connection to the server at wss://my-subdomain.mydomain.tld/socket.

Connecting via my LAN works fine. I have WebSockets enabled for the domain. Is there another setting I need to change?

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