"error occurred:\n\t* unsupported path" listing users created with userpass method in a namespace

[bridany]

Describe the bug
Via UI or via CLI , I can create a user within a namespace with "userpass"
nothing is showed in UI doing list
in the audit log
"error":"1 error occurred:\n\t* unsupported path\n\n"}

I can log in with the created users

To Reproduce
Steps to reproduce the behavior:

1. vault write -namespace=peltest auth/UP/users/pippo password=1234 policies=admin-pel-test
   Success! Data written to: auth/UP/users/pippo
2. vault list -namespace=peltest auth/UP/users
   correct list of users
   Keys

---

admin
pippo
3. See error
4. similar steps in the UI, no users listed

Expected behavior
list of created user

Environment:
*Vault 1.15.0+ent.hsm

Vault server configuration file(s):

ui = true
disable_mlock = true
log_level = "trace"
license_path = "/etc/vault.d/vault.hclic"
 
 
listener "tcp" {
   telemetry {
    unauthenticated_metrics_access = true
           }

  address =         "trti3mt-vaupu04.testops.a.it:8200"                   #nodo locale da cambiare su ogni nodo
  cluster_address = "trti3mt-vaupu04.testops.a.it:8201"                   #nodo locale da cambiare su ogni nodo         
  tls_cert_file = "/etc/vault.d/ssl/trti3mt-vaupu04.testops.a.it.pem"     #nodo locale da cambiare su ogni nodo 
  tls_key_file  = "/etc/vault.d/ssl/trti3mt-vaupu04.testops.a.it.key"     #nodo locale da cambiare su ogni nodo
  tls_disable_client_certs = false
  tls_disable = "false"
}
 
cluster_addr  = "https://trti3mt-vaupu04.testops.a.it:8201"              #nodo locale da cambiare su ogni nodo
api_addr      = "https://vault-poc-up-it3.testops.a.it" #
cluster_name            = "vault-poc-upgrade-it3"
 
 
storage "raft" {
  path    = "/opt/vault/data"
  node_id = "nodo2pocu-it3"              #nodo locale  da cambiare su ogni nodo
     
    #elencare tutti i nodi del cluster
    retry_join {
    leader_tls_servername   = "trti3mt-vaupu03.testops.a.it"
    leader_api_addr         = "https://trti3mt-vaupu03.testops.a.it:8200"
  }
    retry_join {
    leader_tls_servername   = "trti3mt-vaupu04.testops.a.it"
    leader_api_addr         = "https://trti3mt-vaupu04.testops.a.it:8200"
  }
    retry_join {
    leader_tls_servername   = "trti3mt-vaupu05.testops.a.it"
    leader_api_addr         = "https://trti3mt-vaupu05.testops.a.it:8200"
  }
    retry_join {
    leader_tls_servername   = "trti3mt-vaupu06.testops.a.it"
    leader_api_addr         = "https://trti3mt-vaupu06.testops.a.it:8200"
  }
    retry_join {
    leader_tls_servername   = "trti3mt-vaupu07.testops.a.it"
    leader_api_addr         = "https://trti3mt-vaupu07.testops.a.it:8200"
  }
}
 
#esport statische in formato prometheus, saranno lette da telegraf in locale
telemetry {
  disable_hostname = true
  prometheus_retention_time = "12h"
}


reporting {
    license {
        enabled = false
   }
}rub any sensitive values