Personal Vault is not available offline
It would be nice to be able to access the files in Personal Vault while offline. (After some testing with the network disconnected, it appears that I cannot.) I like the security aspect, but I would also like to be access my files when I'm in places with no WiFi or horribly expensive roaming.
It appears that Authenticator can still generate codes without WiFi or Cellular access so why couldn't we use this to unlock the local synced vault files in bitlocker? This would be extremely useful when travelling with internet access either not available, unsecure or very expensive.
Eduardo Braga commented
You can access it offline if it were opened while connected to a network. But yeah, we should be able to open it when offline.