Create session not work on ipad

I want to use ipad to connect to other devices over the LAN, so I used create session to create a session. But on 4.21 it doesn’t seem to work on the iPad, it

always returns failure . 4.19 can return normally, can you help me?

what online subsystems have you enabled in your project?

online subsystem,online subsystem ios,online subsystem NULL.Is the system default