Just noticed vlans are different on PE-CE (PE1 & PE4).
please configure same vlan at interface and update routing-instance with the correction.
PE4:
ge-0/1/9 {
unit 600 {
encapsulation vlan-vpls;
vlan-id 600;
}
PE1:
interfaces {
ge-0/1/8 {
unit 700 {
encapsulation vlan-vpls;
vlan-id 700;
}
}