mavros is not working with ArduSub 3.5

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Hello,

I am using ArduSub 3.5 with mavros and whenever I am using the topic

• mavros/manual_control/send
• mavros/manual_control/control

to send some values the sub still not moving but if I used a simple pymavlink script such as this one I can see it moving what could be the problem?

from pymavlink import mavutil


ip_address = 'udp:127.0.0.1:14551'
master = mavutil.mavlink_connection(ip_address)

master.wait_heartbeat()

master.mav.manual_control_send(
    master.target_system,
    500,
    -500,
    250,
    500,
    0)