func (sys *IAMSys) SetTempUser(ctx context.Context, accessKey string, cred auth.Credentials, policyName string) (time.Time, error) {
	if !sys.Initialized() {
		return time.Time{}, errServerNotInitialized
	}

	if newGlobalAuthZPluginFn() != nil {
		// If OPA is set, we do not need to set a policy mapping.
		policyName = ""
	}

	updatedAt, err := sys.store.SetTempUser(ctx, accessKey, cred, policyName)

		store.group.Forget(accessKey)
	}

	cache.updatedAt = time.Now()

	return err
}

// SetTempUser - saves temporary (STS) credential to storage and cache. If a
// policy name is given, it is associated with the parent user specified in the
// credential.
func (store *IAMStoreSys) SetTempUser(ctx context.Context, accessKey string, cred auth.Credentials, policyName string) (time.Time, error) {

	// policy is inherited from `user.AccessKey`.
	cred.ParentUser = user.AccessKey

	// Set the newly generated credentials.
	updatedAt, err := globalIAMSys.SetTempUser(ctx, cred.AccessKey, cred, "")
	if err != nil {
		writeSTSErrorResponse(ctx, w, ErrSTSInternalError, err)
		return
	}

	// Call hook for site replication.
	if cred.ParentUser != globalActiveCred.AccessKey {

			// Set the newly generated credentials, policyName is empty on purpose
			// LDAP policies are applied automatically using their ldapUser, ldapGroups
			// mapping.
			updatedAt, err := globalIAMSys.SetTempUser(context.Background(), cred.AccessKey, cred, "")
			if err != nil {
				return nil, err
			}

			// Call hook for site replication.

	// Set the newly generated credentials, policyName is empty on purpose
	// LDAP policies are applied automatically using their ldapUser, ldapGroups
	// mapping.
	updatedAt, err := globalIAMSys.SetTempUser(context.Background(), cred.AccessKey, cred, "")
	if err != nil {
		return nil, err
	}

	replLogIf(context.Background(), globalSiteReplicationSys.IAMChangeHook(context.Background(), madmin.SRIAMItem{

		if err != nil {
			return fmt.Errorf("unable to query LDAP server for %s: %w", ldapUser, err)
		}

		cred.Groups = ldapGroups
	}

	// Set these credentials to IAM.
	if _, err := globalIAMSys.SetTempUser(ctx, cred.AccessKey, cred, stsCred.ParentPolicyMapping); err != nil {
		return fmt.Errorf("unable to save STS credential and/or parent policy mapping: %w", err)
	}

	return nil
}