Unable to create the disk storage. Invalid Signature.

Hello,

I recently installed Veritas Backup Exec 20 on Windows Server 2016.
I want to store backups on an Isilon cluster running OneFS 6.5 (I know, it's old).

When I create storage through an SMB share hosted by the cluster, BE shows the following error message: Unable to create the disk storage. Invalid Signature.
I saw that the problem is known: https://www.veritas.com/support/en_US/article.100042594

So, I applied the solution proposed by Microsoft on the Window server, namely:

Set-SmbClientConfiguration -RequireSecuritySignature $false
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\LanmanWorkstation\Parameters" RequireSecureNegotiate -Value 0 -Force

But I still get the same "Invalid signature" error message after restarting the server on which BE is installed.

Is there another solution? What do you think?
Would a solution be to switch to NFS instead? But isn't the connection with the BE service account credentials likely to be a problem?

Thank you. Happy new year.
Best regards,