Command Denied when trying to set imu rate

[Tuxliri]

I am trying to set the imu rate using System.telemetry.set_rate_imu(), however the method throws a CommandDenied exception. I am able to set the raw_imu rate using the respective method System.telemetry.set_rate_imu(), thus I suspect that Ardupilot is producing/advertising the imu() mavlink topic. How can I verify this? Is this a known issue?

Board: SpeedyBee F405v3 FC Software: Ardupilot 4.5.5