Hyper-V Exports fails with 'Attempting to perform the InitializeDefaultDrives operation on the 'FileSystem' provider failed.' (4041993)

There are disconnected network shares on the Hyper-V host. This could be any disconnected share and is not necessarily anything to do with AppAssure or Rapid Recovery.

1. Connect to the Hyper-V host using the account from which the shares were created.
2. Open an elevated command window
3. Type "net use * /delete"

Or you can reconnect the disconnected shares. I do not recommend this as the problem could recur in the future.