@bmac: I've started experiencing the same issue, and although it's not a show-stopper, it is annoying and, for my part, a but worrisome. Clearly something that was working is now broken or functionality has been "downgraded". For me, I've started noticing this over the past few weeks, perhaps in conjunction with the October round of O365 upgrades. I've only recently migrated to OneNote to manage my tasks, and I've been very impressed with how well it interacts with Outlook. Anything that potentially degrades that interaction would be a concern. Hope this gets resolved soon.