Infuse connects to Jellyfin server but can't play media

I’m running a Jellyfin 10.6.4 server with Docker on a Pi 4. Infuse Pro 6.5.5 can see and connect to the local server, but does not play any media. Playback stalls at the loading screen and eventually shows “An error occurred loading this content”. Same results on iPhone and iPad 14.2 devices. All local on the same LAN using default ports.

No problems playing the same content with Infuse from a Plex server and direct on NAS. The native Jellyfin clients also play media just fine from the same Jellyfin server, as do browsers. Seems like it’s specifically an Infuse-Jellyfin problem. How can I get this working?

Diagnostics code: RWDMH