EX4300 switches not joining Virtual Chassis

Hello,

I have two EX4300 switch which I am trying to add to a VC. But for some reason its not working. Can anyone please help?

First switch:

{master:0}
user@EX4300-2> show virtual-chassis    

Preprovisioned Virtual Chassis
Virtual Chassis ID: 23dc.bf78.2698
Virtual Chassis Mode: Enabled
                                                Mstr           Mixed Route Neighbor List
Member ID  Status   Serial No    Model          prio  Role      Mode  Mode ID  Interface
0 (FPC 0)  Prsnt    PGxxxxx ex4300-24t     129   Master*      N  VC
1 (FPC 1)  NotPrsnt PGxxxxxx ex4300-24t    

{master:0}
user@EX4300-2> 


user@EX4300-2> show configuration virtual-chassis 
preprovisioned;
member 0 {
    role routing-engine;
    serial-number PGxxxxx;
}
member 1 {
    role routing-engine;
    serial-number PGxxxxxx;
}

{master:0}
user@EX4300-2> 
----------------------------------------------------------------------

This is the second switch

user@EX4300-2> show virtual-chassis

Preprovisioned Virtual Chassis
Virtual Chassis ID: 23dc.bf78.2698
Virtual Chassis Mode: Enabled
                                                Mstr           Mixed Route Neighbor List
Member ID  Status   Serial No    Model          prio  Role      Mode  Mode ID  Interface
0 (FPC 0)  NotPrsnt PGxxxxx ex4300-24t
1 (FPC 1)  Inactive PGxxxxxxex4300-24t     128   Linecard*    N  VC

{linecard:1}
user@EX4300-2>


user@EX4300-2> show configuration virtual-chassis 
preprovisioned;
member 0 {
    role routing-engine;
    serial-number PGxxxxx;
}
member 1 {
    role routing-engine;
    serial-number PGxxxxxx;
}

Yes, these 2 switches were in VC before. Then they were removed from VC and now I am trying to add it back again.