How to retrieve secret data from vault API using AppRole? - rest

Question

My HashiCorp vault instance is runnning properly on CentOS7. I enabled AppRole authentication, created a policy and a role, enabled secret engine and created a secret for a client application.
I can retrieve the secret data using root CLI but I can't figure out how to get secret data from HTTP API with my application role using curl. I tried a few endpoint combinations without success. Retrieving the client token works, but I can't get secret data itself.
I wonder if the API endpoint is correct or if there is another setting in play.
Authentication method
vault auth enable approle
Policy
# File: my_app /etc/vault/my_app.hcl
path "kv/data/foo/*" {
capabilities = ["read", "list"]
}
# Command line
vault policy write my_app /etc/vault/my_app.hcl
Role
vault write auth/approle/role/my_app policies="my_app"
Secret creation
vault kv put kv/data/foo/user#domain.tld password=1234
API call token request
curl --request POST --data '{"role_id": "xxxxxxxxxxxxxxxxx", "secret_id": "xxxxxxxxxxxxxxxxxxxx"}' http://127.0.0.1:8200/v1/auth/approle/login | jq
Result: Token is properly retrieved
API call for secret data request
export VAULT_CLIENT_TOKEN=XXXXXXX
curl --header "X-Vault-Token: $VAULT_CLIENT_TOKEN" --request GET "http://127.0.0.1:8200/v1/kv/data/foo/user#domain.tld"
Result : No secret data retrieved
Output:
{"errors":[]}
CLI call for secret data
vault kv get -field=password kv/data/foo/user#domain.tld
Output:
1234
Global settings
vault secrets list
Path Type Accessor Description
---- ---- -------- -----------
cubbyhole/ cubbyhole cubbyhole_xxxxxxxx per-token private secret storage
identity/ identity identity_xxxxxxxx identity store
kv/ kv kv_xxxxxxxx n/a
sys/ system system_xxxxxxxx system endpoints used for control, policy and debugging