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Recovery points for Windows Server 2016 volumes with ReFs fail to mount with the error "The current OS does not support file system(s) 'ReFs'."
This issue is related to a known Defect - RR-102437
A patch has been prepared to resolve this issue. Please contact Support for the correct patch.
For more information on the Rapid Recovery Patching process, please reference Knowledge Article 126791 - How To Apply Patches to Cores and Agents.