Hi @AkshayAshirvad-Affin
When you initialized Vault cluster, it should have thrown some keys in the terminal. Be sure to store them safely. There you can find unseal keys and root token. After initializing is done, you should unseal the unseal. You can use the command:
$ vault operator unseal
inside each of the Vault pods and it will request that you insert unseal keys step by step.