Serial port 1 doesn’t not support mavlink 2 to set fence.
Serial port 2 supports it.
When I use telemetry on serial 1 with mavlink 2 to write fence settings to CubeBlack and CubeOrange, get error.
But serial 2 is fine.
Not much info to work from…
What error do you see?
Have you got SERIAL1_PROTOCOL,2 ?
Are you on latest stable firmware?
Can you provide a .bin log file or parameter file?