ROBOCOPY will accept UNC pathnames including UNC pathnames over 256 characters long.
"/256 Turns off support for paths longer than 256 characters."
Below is an article of the guides to migrate to Azure file shares:
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I had a problem like that while trying to migrate servers and the Professionals adviced me to shorten the path name and to follow a link and to do ome troubleshooting with the windows but no way because I need the folders and the structure to be copied as it. Finally I found a way to solve this issue, a friend recommend me Long path tool and Gs RichCopy 360, both were great and my task done .