Error unsealing: Error making API request

Error unsealing: Error making API request.

URL PUT http://127.0.0.1:8200/v1/sys/unseal
Code: 400 Errors:
*Vault is not initialized

Getting the above error after installing vault in HA mode.
config file:
server:
affinity: “”
ha:
enabled: true
raft:
enabled: true
Able to run vault operator init on vault-0 and unseal it using the key. But when i run unseal command on vault-1 and vault-2 pod throwing the above error.

Vault Version : 1.15.2