About changing the Backup Exec Service Account

Hi guys,

I was trying to change the BESA from the default one. But since I failed to do so using the RemoteLaunch (Configuraton and Settings -> Backup Exec Services -> Edit Credentials), I tried the BEUtility. However, it was in vain with the errors below:

Set server configuration started on list of servers.
Setting configuration info for server: BACKUPSV01.
Error: Failed setting configuration.  Server:BACKUPSV01, service:BackupExecDeviceMediaService, err:0x421, 1057.
Error: Failed setting configuration.  Server:BACKUPSV01, service:BackupExecRPCService, err:0x421, 1057.
Error: Failed setting configuration.  Server:BACKUPSV01, service:BackupExecManagementService, err:0x421, 1057.
Error: Failed setting configuration.  Server:BACKUPSV01, service:BackupExecJobEngine, err:0x421, 1057.
Error: Failed setting configuration.  Server:BACKUPSV01, service:BackupExecAgentBrowser, err:0x421, 1057.
Set server configuration completed with errors.
Set server configuration operation has completed.

Could anyone please help on it? Thanks in advance.

P.S. I was adding a SAN storage, and it kept saying the default BESA doesn't have the read/write rights on that share. That's why I want to change the BESA to the one currently granted with access to the share.