Customer was getting the below error:

root@switch> run show interfaces mc-ae

Member Link : ae246

Current State Machine's State: mcae config exchange error

Configuration Error Status : No Error

Local Status : active

Local State : up

Peer Status : Unknown

Peer State : Unknown

Logical Interface : ae246.0

Topology Type : bridge

Local State : up

Peer State : Unknown

Peer Ip/MCP/State : 10.10.10.1 ae200.0 up

And interface was showing down:

root@switch> show interfaces terse | match ae246

ae246          up  down

ae246.0         up  down eth-switch

 The status control was active on both side:

    ae246 {
        aggregated-ether-options {
            lacp {
                active;
                system-id 00:00:00:00:00:02;
                admin-key 246;
            }
            mc-ae {
                mc-ae-id 246;
                redundancy-group 1;
                chassis-id 0;
                mode active-active; 
                status-control active; >>> was same on both side. 
                init-delay-time 240;
            }
        }

After we changed to active / standby on one of the peers, interface started to work and showing up.