Linkerd-jaeger with a alloy collector continously has InvalidContentType

I’m trying to get linkerd-jaeger running with opentelemetry and alloy as an collector. Currently I didn’t get it to work. There is an error mentioning InvalidContentType when the linkerd-proxy is trying to deliver the informations to the otel (grpc) endpoint on alloy. The deployed traefik is doing it and I get the information but not linkerd.
As linkerd-jaeger is now also using opentelemetry I would expect that’s doing the job. But as of now I haven’t got it working.
Has somebody already done that?
m.

What version of Linkerd are you running? and can you share your linkerd-jaeger configuration? Thanks!