Token auth does not work

I've set up the Grafana to Matrix Forwarder and tested the settings with Grafana cloud.

When I run a test I get an error in the logs of the container:

failed to PUT /_matrix/client/v3/rooms/<roomID>/send/m.room.message/mautrix-go_1697470131842057961_3: M_UNKNOWN_TOKEN (HTTP 401): Unrecognised access token.

But the token is correct. I use it with another monitoring solutions.

Any advice what I need to do to function properly?

Thanks in advance.

Edit: This is only the case, if I use the app together with pantalaimon because of encrypted messages. Pantalaimon can not recognize the token. Do you have an idea for this?