InfuseSync Status NotSupported

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...and there is (in contrast to emby, what is close to jellyfin) no adequate streaming client for apple tvOS than Infuse!

Update:
for all others who have the same, the InfuseSync.dll 1.5.0.0 is marked as "Active" also in Jellyfin 10.9.3 (server Admin settings)
I edited it manually and after a reboot of the jellyfin server it is set to PlugIn state 1.5.0.0

Glad you were able to find a solution. Infuse is a closed source, proprietary client as far as I know, so there's no way for the Jellyfin dev team to know what breaks something they aren't able to see.

I quoted your first line because...no...Jellyfin is NOT close to Emby. It was forked off from Emby when it went closed source. That was years ago and it has changed massively since then. Comparing the two is like comparing limes and oranges. While both citrus, they're very different fruit.