set up ClickHouse keeper cross AKS cluster

[chaos827]

I followed this article(https://www.farukcevik.com.tr/blog/2024/02/07/clickhousedisasterrecovery/) to set up ClickHouse in two data centers, for the ClickHouse instance, I used external Load Balancer ip to set up remote servers and it works well, so I followed the same way to set up ClickHouse Keeper, but seems the only 3 prod keeper instances are active, the bcp instances are not health.

this may config for the primary
<keeper_server>
<server_id>1</server_id>
<raft_configuration>
1hostname19444
2hostname29444
3hostname39444
4external load balancer ip for bcp19444
5external load balancer ip for bcp29444
6external load balancer ip for bcp39444
</raft_configuration>
</keeper_server>

for the bcp:
<keeper_server>
<server_id>1</server_id>
<raft_configuration>
1external load balancer ip for prod19444
2external load balancer ip for prod29444
3external load balancer ip for prod39444
4hostname19444
5hostname29444
6hostname39444
</raft_configuration>
</keeper_server>

I used clickhouse-keeper-client to show the config info, the prod keeper, shows there are 6 servers, and in the BCP, the clickhouse-keeper-client throws error:
Coordination::Exception: All connection tries failed while connecting to ZooKeeper. nodes: 10.200.0.10:2181
Code: 999. Coordination::Exception: Keeper server rejected the connection during the handshake. Possibly it's overloaded, doesn't see leader or stale: while receiving handshake from ZooKeeper. (KEEPER_EXCEPTION) (version 24.5.1.1763 (official build)), 10.200.0.10:2181

I do not figure out why the clickhkouse-keeper-client throws this error, and if I set the bcp clickhouse to only connect to the bcp keeper, the bcp clickhouse data is uncoordinated, does someone know how to set up keeper in two AKS?
Many thanks.