Cant connect to MLAG peer via peer-link

Hello, 

I was following example from https://support.edge-core.com/hc/en-us/articles/7351111673625--Enterprise-Switch-The-behavior-of-MLAG-and-how-to-configure-MLAG-environment

and use the same switch (5520) and same configuration except using port 1/18 as the peer link. 

Switch-A & Switch B Config: 

interface ethernet 1/1
 description Switch-C
 no negotiation
 switchport allowed vlan add 1-2 tagged
 switchport mode trunk
 spanning-tree spanning-disabled
 
!

...

interface ethernet 1/18
 no negotiation
 no mac-learning
 switchport allowed vlan add 1-2 tagged
 switchport mode trunk
 spanning-tree spanning-disabled                                     
 
!

...

interface vlan 2
 ip address 1xx.xx.xx.xx 255.255.255.0
 alias mgmt_net
!

...

mlag domain SSS peer-link ethernet 1/18
mlag group 1 domain SSS member ethernet 1/1
!

Switch-C Config (connected to e 1/49 and 1/50)

interface ethernet 1/49
 no negotiation
 switchport broadcast packet-rate 1000
 no lldp dot3-tlv poe
 no lldp med-tlv ext-poe
 switchport allowed vlan add 1 untagged
 switchport mode trunk
 switchport allowed vlan add 1-3 tagged

 channel-group 1
!
interface ethernet 1/50                                              
 no negotiation
 switchport broadcast packet-rate 1000
 no lldp dot3-tlv poe
 no lldp med-tlv ext-poe
 switchport allowed vlan add 1 untagged
 switchport mode trunk
 switchport allowed vlan add 1-3 tagged

 channel-group 1
!

When the mlag established, I cannot connect vlan 2 (management) from Switch-A to Switch-B.

How to enable/forward the vlan via peer-link or any workaround to be able manage Switch-A and Switch-B?