Unable to authenticate with replication setup

Hello everyone,

i'm currently migrating my Elastic plateform to another server and i've setup for a long time a dual node cluster with a full replication (1 shard, 1 replicate).

Checking my cluster with Cerebro, i'm able to see that every indice is being replicated to the cluster without any error.

But if i restart one of my two nodes in my cluster, i'm no longer able to authenticate myself including all my agents who are sending logs to my cluster.

Is there any more options to activate for this ? Both my nodes have the master, ingest and data roles and the minimum amount of master in my cluster is set to 1

I also setup a LoadBalancer in front of my both nodes so if a node is down, all the query are going to the other online server. I can confirm my load balancer is working properly

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