An error occurred while saving the commentKevin Allston commented
For those with the issue of O365 services such as Outlook, OneDrive, or OneNote not working with a VPN client running, I found that using the IKEV2 protocol resolved all my issues.
For example, if you use NordVPN, instead of relying on their native app (OpenVPN protocol?), utilize the manual IKEV2 setup procedure listed as an alternate approach within the NordVPN Win10 installation documentation. It's not a perfect solution because the native app has some added conveniences, however it has proved a painless workaround for me so far. Hope this helps some of you!