Recently an Veeam Backup and Replication Software was upgraded from v8 to 9.5 , to fix an issue with Internal Database

Failed to copy item ‘\\network\Location’ Error: The filename, directory name, or volume label syntax is incorrect

this feature is not supported since version 9, so this might work but the product does not guarrantee this feature would work properly, and unfortunately we do not support features that does not supported by the version you are using.

please see this guide: https://helpcenter.veeam.com/docs/backup/hyperv/file_copy_source.html?ver=95

it says “You cannot use deduplicating storage appliances, shared folder backup repositories and shared folders as a source for the file copy job.”

This is annoying as it did work with Older Versions , in the end , I have to add \\network\Location\Folder ( extra folder on the end ) for the source folder instead of \\network\Location