vPC-based multihoming in MPLS SR EVPN environment

[config]

Hello everyone, 

I have a question. I'm trying to configure L3 EVPN with MPLS SR on my pair of Nexus 93180 switches, as documented here: https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/103x/configuration/label-switching/cisco-nexus-9000-series-nx-os-label-switching-configuration-guide-103x/m-configuring-segment-routing.html#Cisco_Concept.dita_f9a89a6d-57f3-4a62-952f-c72173f1...

I have configured vPC Multihoming, with Loopback primary, and secondary IP. 

VPC primary 

interface loopback0
  ip address 10.1.100.101/32
  ip address 10.1.100.100/32 secondary

VPC secodary

interface loopback0
  ip address 10.1.100.102/32
  ip address 10.1.100.100/32 secondary

I have also configured a virtual secondary IP address to advertise it through the MPLS label-switched path. 

VPC primary 

segment-routing
    mpls
      global-block 100000 300000
      connected-prefix-sid
         address-family ipv4 unicast
         10.1.100.101 index 101
         10.1.100.100 index 100

VPC secondary 

segment-routing
    mpls
      global-block 100000 300000
      connected-prefix-sid
         address-family ipv4 unicast
         10.1.100.102 index 102
         10.1.100.100 index 100

But both switches advertise client IP prefix with different primary Loopback IP (10.1.100.101/32, 10.1.100.102/32), instead of the expected 10.1.100.100/32. 

Would you help me diagnose the problem?