Unable to allow Onenote to sync with Microsoft servers

Hi, I've been plagued with issues surrounding my Onenote program and it not syncing properly with Microsoft's servers. The error message I usually get is as follows:

We can't connect to the server for some reason. Try checking your connection to see if the server is available. (Error code: 0x80072EFD bdf5j)

I think it's to do with BitDefender, as when I disable the program, Onenote syncs fairly consistently. I've tried adding exceptions to the Antivirus but I don't think they've done much to allow syncing; has anyone else experienced this issue and if so, is there a verified workaround?