Using Outlook for Android in business environments for email and scheduling
After hundreds of back and forth messages with the in-app support team, the problem was resolved by the most recent update despite trying pretty much everything they could throw at me. It does appear to be a systemic issue affecting random accounts although at this time no one wants to admit there is a problem. As a temporary solution I would suggest installing Outlook Lite which worked perfectly for me and just waiting for the next update if you don't feel like spending hours and energy with the in-app support team. :)