Opensearch restore no permissions error

I have the following scenario :

• I have an Opensearch domain A in AWS account A
• I have another Opensearch domain B in AWS account B
• I would like to take a snapshot in domain A and then restore it in domain B. When I do that, I have the following error :

{
  "body": "Snapshot restore failed: {
    "error": {
      "root_cause": [
        {
          "type": "security_exception",
          "reason": "no permissions for [] and User [name=<my_user>, backend_roles=[], requestedTenant=null]"
        }
      ],
      "type": "security_exception",
      "reason": "no permissions for [] and User [name=<my_user>, backend_roles=[], requestedTenant=null]"
    },
    "status": 403
  }"
}

I have gone through a lot of examples and would like to add that I only take snapshot of a specific indexes and not indexes such as the .opendistro_security index.

My user has also the manage_snapshots permissions so he is able to do any action related to snapshots.

Regards