Thank you very much Ian_Xue,
it is working now.
[02/07/2024 08:44:20] 0x80045303, The specified object already exists.
[02/07/2024 08:44:20] 0x80045303, The specified object already exists.
[02/07/2024 08:44:20] 0x80045303, The specified object already exists.
unfortunately this type of outcome does not help me to understand which folder generated the error.
it is possible have more details of the error (for example would be enough to have also the line below the error that says: : +New-FsrmQuota -Path "D:\Vol01\folder1" -Size 8GB)
PS C:\WINDOWS\system32> New-FsrmQuota -Path "D:\Vol01\folder1" -Size 8GB
New-FsrmQuota : 0x80045303, The specified object already exists.
At line:1 char:1
+ New-FsrmQuota -Path "D:\Vol01\folder1" -Size 8GB
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ResourceExists: (MSFT_FSRMQuota:Root/Microsoft/.../MSFT_FSRMQuota) [New-FsrmQuota], CimException
+ FullyQualifiedErrorId : MI RESULT 11,New-FsrmQuota