A Granular GRT backup of a Hyper-V guest is failing with a Writer error.
The error: "0xe000fed1 - A failure occurred querying the Writer status." occurs resulting in a failed VM backup.
After a review of Windows Event Logs, it was found that the Hyper-V Writer was failing during a backup.
The Hyper-V VSS Writer on the Hyper-V Host invoked a connection to various VSS Writers on the VM guest.
The SharePoint VSS Writer was failing on the VM guest.
The version of the SharePoint VSS Writer was out of date.
This issue may be resolved by running the following command at the command prompt of the Hyper-V Guest.
"PSConfig.exe -cmd upgrade -inplace b2b -force -cmd applicationcontent -install -cmd installfeatures"
Please refer to the following LINK before making any changes to any production server.